    /**
     * @class Ext.data.NodeInterface
     * This class is meant to be used as a set of methods that are applied to the prototype of a
     * Record to decorate it with a Node API. This means that models used in conjunction with a tree
     * will have all of the tree related methods available on the model. In general this class will
     * not be used directly by the developer. This class also creates extra fields on the model if
     * they do not exist, to help maintain the tree state and UI. These fields are:
     * <ul>
     * <li>parentId</li>
     * <li>index</li>
     * <li>depth</li>
     * <li>expanded</li>
     * <li>expandable</li>
     * <li>checked</li>
     * <li>leaf</li>
     * <li>cls</li>
     * <li>iconCls</li>
     * <li>root</li>
     * <li>isLast</li>
     * <li>isFirst</li>
     * <li>allowDrop</li>
     * <li>allowDrag</li>
     * <li>loaded</li>
     * <li>loading</li>
     * <li>href</li>
     * <li>hrefTarget</li>
     * <li>qtip</li>
     * <li>qtitle</li>
     * </ul>
     *
     */
    Ext.define('Ext.data.NodeInterface', {
        requires: ['Ext.data.Field', 'Ext.data.ModelManager'],

        alternateClassName: 'Ext.data.Node',

        /**
         * @property nextSibling
         * A reference to this node's next sibling node. `null` if this node does not have a next sibling.
         */

        /**
         * @property previousSibling
         * A reference to this node's previous sibling node. `null` if this node does not have a previous sibling.
         */

        /**
         * @property parentNode
         * A reference to this node's parent node. `null` if this node is the root node.
         */

        /**
         * @property lastChild
         * A reference to this node's last child node. `null` if this node has no children.
         */

        /**
         * @property firstChild
         * A reference to this node's first child node. `null` if this node has no children.
         */

        /**
         * @property childNodes
         * An array of this nodes children.  Array will be empty if this node has no chidren.
         */

        statics: {
            /**
             * This method allows you to decorate a Record's prototype to implement the NodeInterface.
             * This adds a set of methods, new events, new properties and new fields on every Record
             * with the same Model as the passed Record.
             * @param {Ext.data.Model} record The Record you want to decorate the prototype of.
             * @static
             */
            decorate: function(record) {
                if (!record.isNode) {
                    // Apply the methods and fields to the prototype
                    var mgr = Ext.data.ModelManager,
                        modelName = record.modelName,
                        modelClass = mgr.getModel(modelName),
                        newFields = [],
                        i, newField, len;

                    // Start by adding the NodeInterface methods to the Model's prototype
                    modelClass.override(this.getPrototypeBody());

                    newFields = this.applyFields(modelClass, [
                        {name: 'parentId',   type: 'string',  defaultValue: null},
                        {name: 'index',      type: 'int',     defaultValue: 0},
                        {name: 'depth',      type: 'int',     defaultValue: 0},
                        {name: 'expanded',   type: 'bool',    defaultValue: false, persist: false},
                        {name: 'expandable', type: 'bool',    defaultValue: true, persist: false},
                        {name: 'checked',    type: 'auto',    defaultValue: null},
                        {name: 'leaf',       type: 'bool',    defaultValue: false, persist: false},
                        {name: 'cls',        type: 'string',  defaultValue: null, persist: false},
                        {name: 'iconCls',    type: 'string',  defaultValue: null, persist: false},
                        {name: 'root',       type: 'boolean', defaultValue: false, persist: false},
                        {name: 'isLast',     type: 'boolean', defaultValue: false, persist: false},
                        {name: 'isFirst',    type: 'boolean', defaultValue: false, persist: false},
                        {name: 'allowDrop',  type: 'boolean', defaultValue: true, persist: false},
                        {name: 'allowDrag',  type: 'boolean', defaultValue: true, persist: false},
                        {name: 'loaded',     type: 'boolean', defaultValue: false, persist: false},
                        {name: 'loading',    type: 'boolean', defaultValue: false, persist: false},
                        {name: 'href',       type: 'string',  defaultValue: null, persist: false},
                        {name: 'hrefTarget', type: 'string',  defaultValue: null, persist: false},
                        {name: 'qtip',       type: 'string',  defaultValue: null, persist: false},
                        {name: 'qtitle',     type: 'string',  defaultValue: null, persist: false}
                    ]);

                    len = newFields.length;

                    // We set a dirty flag on the fields collection of the model. Any reader that
                    // will read in data for this model will update their extractor functions.
                    modelClass.getFields().isDirty = true;

                    // Set default values
                    for (i = 0; i < len; ++i) {
                        newField = newFields[i];
                        if (record.get(newField.getName()) === undefined) {
                            record.data[newField.getName()] = newField.getDefaultValue();
                        }
                    }
                }

                if (!record.isDecorated) {
                    record.isDecorated = true;

                    Ext.applyIf(record, {
                        firstChild: null,
                        lastChild: null,
                        parentNode: null,
                        previousSibling: null,
                        nextSibling: null,
                        childNodes: []
                    });

                    record.enableBubble([
                        /**
                         * @event append
                         * Fires when a new child node is appended
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} node The newly appended node
                         * @param {Number} index The index of the newly appended node
                         */
                        "append",

                        /**
                         * @event remove
                         * Fires when a child node is removed
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} node The removed node
                         */
                        "remove",

                        /**
                         * @event move
                         * Fires when this node is moved to a new location in the tree
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} oldParent The old parent of this node
                         * @param {Ext.data.NodeInterface} newParent The new parent of this node
                         * @param {Number} index The index it was moved to
                         */
                        "move",

                        /**
                         * @event insert
                         * Fires when a new child node is inserted.
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} node The child node inserted
                         * @param {Ext.data.NodeInterface} refNode The child node the node was inserted before
                         */
                        "insert",

                        /**
                         * @event beforeappend
                         * Fires before a new child is appended, return false to cancel the append.
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} node The child node to be appended
                         */
                        "beforeappend",

                        /**
                         * @event beforeremove
                         * Fires before a child is removed, return false to cancel the remove.
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} node The child node to be removed
                         */
                        "beforeremove",

                        /**
                         * @event beforemove
                         * Fires before this node is moved to a new location in the tree. Return false to cancel the move.
                         * @param {Ext.data.NodeInterface} this This node
                         * @param {Ext.data.NodeInterface} oldParent The parent of this node
                         * @param {Ext.data.NodeInterface} newParent The new parent this node is moving to
                         * @param {Number} index The index it is being moved to
                         */
                        "beforemove",

                         /**
                          * @event beforeinsert
                          * Fires before a new child is inserted, return false to cancel the insert.
                          * @param {Ext.data.NodeInterface} this This node
                          * @param {Ext.data.NodeInterface} node The child node to be inserted
                          * @param {Ext.data.NodeInterface} refNode The child node the node is being inserted before
                          */
                        "beforeinsert",

                        /**
                         * @event expand
                         * Fires when this node is expanded.
                         * @param {Ext.data.NodeInterface} this The expanding node
                         */
                        "expand",

                        /**
                         * @event collapse
                         * Fires when this node is collapsed.
                         * @param {Ext.data.NodeInterface} this The collapsing node
                         */
                        "collapse",

                        /**
                         * @event beforeexpand
                         * Fires before this node is expanded.
                         * @param {Ext.data.NodeInterface} this The expanding node
                         */
                        "beforeexpand",

                        /**
                         * @event beforecollapse
                         * Fires before this node is collapsed.
                         * @param {Ext.data.NodeInterface} this The collapsing node
                         */
                        "beforecollapse",

                        /**
                         * @event sort
                         * Fires when this node's childNodes are sorted.
                         * @param {Ext.data.NodeInterface} this This node.
                         * @param {Ext.data.NodeInterface[]} childNodes The childNodes of this node.
                         */
                        "sort",

                        'load'
                    ]);
                }

                return record;
            },

            applyFields: function(modelClass, addFields) {
                var modelPrototype = modelClass.prototype,
                    fields = modelPrototype.fields,
                    keys = fields.keys,
                    ln = addFields.length,
                    addField, i,
                    newFields = [];

                for (i = 0; i < ln; i++) {
                    addField = addFields[i];
                    if (!Ext.Array.contains(keys, addField.name)) {
                        addField = Ext.create('Ext.data.Field', addField);

                        newFields.push(addField);
                        fields.add(addField);
                    }
                }

                return newFields;
            },

            getPrototypeBody: function() {
                return {
                    isNode: true,

                    /**
                     * Ensures that the passed object is an instance of a Record with the NodeInterface applied
                     * @return {Boolean}
                     * @private
                     */
                    createNode: function(node) {
                        if (Ext.isObject(node) && !node.isModel) {
                            node = Ext.data.ModelManager.create(node, this.modelName);
                        }
                        // Make sure the node implements the node interface
                        return Ext.data.NodeInterface.decorate(node);
                    },

                    /**
                     * Returns true if this node is a leaf
                     * @return {Boolean}
                     */
                    isLeaf : function() {
                        return this.get('leaf') === true;
                    },

                    /**
                     * Sets the first child of this node
                     * @private
                     * @param {Ext.data.NodeInterface} node
                     */
                    setFirstChild : function(node) {
                        this.firstChild = node;
                    },

                    /**
                     * Sets the last child of this node
                     * @private
                     * @param {Ext.data.NodeInterface} node
                     */
                    setLastChild : function(node) {
                        this.lastChild = node;
                    },

                    /**
                     * Updates general data of this node like isFirst, isLast, depth. This
                     * method is internally called after a node is moved. This shouldn't
                     * have to be called by the developer unless they are creating custom
                     * Tree plugins.
                     * @return {Boolean}
                     */
                    updateInfo: function(silent) {
                        var me = this,
                            parentNode = me.parentNode,
                            isFirst = (!parentNode ? true : parentNode.firstChild == me),
                            isLast = (!parentNode ? true : parentNode.lastChild == me),
                            depth = 0,
                            parent = me,
                            children = me.childNodes,
                            ln = children.length,
                            i;

                        while (parent.parentNode) {
                            ++depth;
                            parent = parent.parentNode;
                        }

                        me.beginEdit();
                        me.set({
                            isFirst: isFirst,
                            isLast: isLast,
                            depth: depth,
                            index: parentNode ? parentNode.indexOf(me) : 0,
                            parentId: parentNode ? parentNode.getId() : null
                        });
                        me.endEdit(silent);
                        if (silent) {
                            me.commit(silent);
                        }

                        for (i = 0; i < ln; i++) {
                            children[i].updateInfo(silent);
                        }
                    },

                    /**
                     * Returns true if this node is the last child of its parent
                     * @return {Boolean}
                     */
                    isLast : function() {
                       return this.get('isLast');
                    },

                    /**
                     * Returns true if this node is the first child of its parent
                     * @return {Boolean}
                     */
                    isFirst : function() {
                       return this.get('isFirst');
                    },

                    /**
                     * Returns true if this node has one or more child nodes, else false.
                     * @return {Boolean}
                     */
                    hasChildNodes : function() {
                        return !this.isLeaf() && this.childNodes.length > 0;
                    },

                    /**
                     * Returns true if this node has one or more child nodes, or if the <tt>expandable</tt>
                     * node attribute is explicitly specified as true, otherwise returns false.
                     * @return {Boolean}
                     */
                    isExpandable : function() {
                        var me = this;

                        if (me.get('expandable')) {
                            return !(me.isLeaf() || (me.isLoaded() && !me.hasChildNodes()));
                        }
                        return false;
                    },

                    /**
                     * <p>Insert node(s) as the last child node of this node.</p>
                     * <p>If the node was previously a child node of another parent node, it will be removed from that node first.</p>
                     * @param {Ext.data.NodeInterface/Ext.data.NodeInterface[]} node The node or Array of nodes to append
                     * @return {Ext.data.NodeInterface} The appended node if single append, or null if an array was passed
                     */
                    appendChild : function(node, suppressEvents, suppressNodeUpdate) {
                        var me = this,
                            i, ln,
                            index,
                            oldParent,
                            ps;

                        // if passed an array or multiple args do them one by one
                        if (Ext.isArray(node)) {
                            for (i = 0, ln = node.length; i < ln; i++) {
                                me.appendChild(node[i]);
                            }
                        } else {
                            // Make sure it is a record
                            node = me.createNode(node);

                            if (suppressEvents !== true && me.fireEvent("beforeappend", me, node) === false) {
                                return false;
                            }

                            index = me.childNodes.length;
                            oldParent = node.parentNode;

                            // it's a move, make sure we move it cleanly
                            if (oldParent) {
                                if (suppressEvents !== true && node.fireEvent("beforemove", node, oldParent, me, index) === false) {
                                    return false;
                                }
                                oldParent.removeChild(node, null, false, true);
                            }

                            index = me.childNodes.length;
                            if (index === 0) {
                                me.setFirstChild(node);
                            }

                            me.childNodes.push(node);
                            node.parentNode = me;
                            node.nextSibling = null;

                            me.setLastChild(node);

                            ps = me.childNodes[index - 1];
                            if (ps) {
                                node.previousSibling = ps;
                                ps.nextSibling = node;
                                ps.updateInfo(suppressNodeUpdate);
                            } else {
                                node.previousSibling = null;
                            }

                            node.updateInfo(suppressNodeUpdate);

                            // As soon as we append a child to this node, we are loaded
                            if (!me.isLoaded()) {
                                me.set('loaded', true);
                            }
                            // If this node didnt have any childnodes before, update myself
                            else if (me.childNodes.length === 1) {
                                me.set('loaded', me.isLoaded());
                            }

                            if (suppressEvents !== true) {
                                me.fireEvent("append", me, node, index);

                                if (oldParent) {
                                    node.fireEvent("move", node, oldParent, me, index);
                                }
                            }

                            return node;
                        }
                    },

                    /**
                     * Returns the bubble target for this node
                     * @private
                     * @return {Object} The bubble target
                     */
                    getBubbleTarget: function() {
                        return this.parentNode;
                    },

                    /**
                     * Removes a child node from this node.
                     * @param {Ext.data.NodeInterface} node The node to remove
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Ext.data.NodeInterface} The removed node
                     */
                    removeChild : function(node, destroy, suppressEvents, suppressNodeUpdate) {
                        var me = this,
                            index = me.indexOf(node);

                        if (index == -1 || (suppressEvents !== true && me.fireEvent("beforeremove", me, node) === false)) {
                            return false;
                        }

                        // remove it from childNodes collection
                        Ext.Array.erase(me.childNodes, index, 1);

                        // update child refs
                        if (me.firstChild == node) {
                            me.setFirstChild(node.nextSibling);
                        }
                        if (me.lastChild == node) {
                            me.setLastChild(node.previousSibling);
                        }

                        if (suppressEvents !== true) {
                            me.fireEvent("remove", me, node);
                        }

                        // update siblings
                        if (node.previousSibling) {
                            node.previousSibling.nextSibling = node.nextSibling;
                            node.previousSibling.updateInfo(suppressNodeUpdate);
                        }
                        if (node.nextSibling) {
                            node.nextSibling.previousSibling = node.previousSibling;
                            node.nextSibling.updateInfo(suppressNodeUpdate);
                        }

                        // If this node suddenly doesnt have childnodes anymore, update myself
                        if (!me.childNodes.length) {
                            me.set('loaded', me.isLoaded());
                        }

                        if (destroy) {
                            node.destroy(true);
                        } else {
                            node.clear();
                        }

                        return node;
                    },

                    /**
                     * Creates a copy (clone) of this Node.
                     * @param {String} id (optional) A new id, defaults to this Node's id.
                     * @param {Boolean} deep (optional) <p>If passed as <code>true</code>, all child Nodes are recursively copied into the new Node.</p>
                     * <p>If omitted or false, the copy will have no child Nodes.</p>
                     * @return {Ext.data.NodeInterface} A copy of this Node.
                     */
                    copy: function(newId, deep) {
                        var me = this,
                            result = me.callOverridden(arguments),
                            len = me.childNodes ? me.childNodes.length : 0,
                            i;

                        // Move child nodes across to the copy if required
                        if (deep) {
                            for (i = 0; i < len; i++) {
                                result.appendChild(me.childNodes[i].copy(true));
                            }
                        }
                        return result;
                    },

                    /**
                     * Clear the node.
                     * @private
                     * @param {Boolean} destroy True to destroy the node.
                     */
                    clear : function(destroy) {
                        var me = this;

                        // clear any references from the node
                        me.parentNode = me.previousSibling = me.nextSibling = null;
                        if (destroy) {
                            me.firstChild = me.lastChild = null;
                        }
                    },

                    /**
                     * Destroys the node.
                     */
                    destroy : function(silent) {
                        /*
                         * Silent is to be used in a number of cases
                         * 1) When setRoot is called.
                         * 2) When destroy on the tree is called
                         * 3) For destroying child nodes on a node
                         */
                        var me = this,
                            options = me.destroyOptions;

                        if (silent === true) {
                            me.clear(true);
                            Ext.each(me.childNodes, function(n) {
                                n.destroy(true);
                            });
                            me.childNodes = null;
                            delete me.destroyOptions;
                            me.callOverridden([options]);
                        } else {
                            me.destroyOptions = silent;
                            // overridden method will be called, since remove will end up calling destroy(true);
                            me.remove(true);
                        }
                    },

                    /**
                     * Inserts the first node before the second node in this nodes childNodes collection.
                     * @param {Ext.data.NodeInterface} node The node to insert
                     * @param {Ext.data.NodeInterface} refNode The node to insert before (if null the node is appended)
                     * @return {Ext.data.NodeInterface} The inserted node
                     */
                    insertBefore : function(node, refNode, suppressEvents) {
                        var me = this,
                            index     = me.indexOf(refNode),
                            oldParent = node.parentNode,
                            refIndex  = index,
                            ps;

                        if (!refNode) { // like standard Dom, refNode can be null for append
                            return me.appendChild(node);
                        }

                        // nothing to do
                        if (node == refNode) {
                            return false;
                        }

                        // Make sure it is a record with the NodeInterface
                        node = me.createNode(node);

                        if (suppressEvents !== true && me.fireEvent("beforeinsert", me, node, refNode) === false) {
                            return false;
                        }

                        // when moving internally, indexes will change after remove
                        if (oldParent == me && me.indexOf(node) < index) {
                            refIndex--;
                        }

                        // it's a move, make sure we move it cleanly
                        if (oldParent) {
                            if (suppressEvents !== true && node.fireEvent("beforemove", node, oldParent, me, index, refNode) === false) {
                                return false;
                            }
                            oldParent.removeChild(node);
                        }

                        if (refIndex === 0) {
                            me.setFirstChild(node);
                        }

                        Ext.Array.splice(me.childNodes, refIndex, 0, node);
                        node.parentNode = me;

                        node.nextSibling = refNode;
                        refNode.previousSibling = node;

                        ps = me.childNodes[refIndex - 1];
                        if (ps) {
                            node.previousSibling = ps;
                            ps.nextSibling = node;
                            ps.updateInfo();
                        } else {
                            node.previousSibling = null;
                        }

                        node.updateInfo();

                        if (!me.isLoaded()) {
                            me.set('loaded', true);
                        }
                        // If this node didnt have any childnodes before, update myself
                        else if (me.childNodes.length === 1) {
                            me.set('loaded', me.isLoaded());
                        }

                        if (suppressEvents !== true) {
                            me.fireEvent("insert", me, node, refNode);

                            if (oldParent) {
                                node.fireEvent("move", node, oldParent, me, refIndex, refNode);
                            }
                        }

                        return node;
                    },

                    /**
                     * Insert a node into this node
                     * @param {Number} index The zero-based index to insert the node at
                     * @param {Ext.data.Model} node The node to insert
                     * @return {Ext.data.Model} The record you just inserted
                     */
                    insertChild: function(index, node) {
                        var sibling = this.childNodes[index];
                        if (sibling) {
                            return this.insertBefore(node, sibling);
                        }
                        else {
                            return this.appendChild(node);
                        }
                    },

                    /**
                     * Removes this node from its parent
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Ext.data.NodeInterface} this
                     */
                    remove : function(destroy, suppressEvents) {
                        var parentNode = this.parentNode;

                        if (parentNode) {
                            parentNode.removeChild(this, destroy, suppressEvents, true);
                        }
                        return this;
                    },

                    /**
                     * Removes all child nodes from this node.
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Ext.data.NodeInterface} this
                     */
                    removeAll : function(destroy, suppressEvents) {
                        var cn = this.childNodes,
                            n;

                        while ((n = cn[0])) {
                            this.removeChild(n, destroy, suppressEvents);
                        }
                        return this;
                    },

                    /**
                     * Returns the child node at the specified index.
                     * @param {Number} index
                     * @return {Ext.data.NodeInterface}
                     */
                    getChildAt : function(index) {
                        return this.childNodes[index];
                    },

                    /**
                     * Replaces one child node in this node with another.
                     * @param {Ext.data.NodeInterface} newChild The replacement node
                     * @param {Ext.data.NodeInterface} oldChild The node to replace
                     * @return {Ext.data.NodeInterface} The replaced node
                     */
                    replaceChild : function(newChild, oldChild, suppressEvents) {
                        var s = oldChild ? oldChild.nextSibling : null;

                        this.removeChild(oldChild, suppressEvents);
                        this.insertBefore(newChild, s, suppressEvents);
                        return oldChild;
                    },

                    /**
                     * Returns the index of a child node
                     * @param {Ext.data.NodeInterface} node
                     * @return {Number} The index of the node or -1 if it was not found
                     */
                    indexOf : function(child) {
                        return Ext.Array.indexOf(this.childNodes, child);
                    },

                    /**
                     * Gets the hierarchical path from the root of the current node.
                     * @param {String} field (optional) The field to construct the path from. Defaults to the model idProperty.
                     * @param {String} separator (optional) A separator to use. Defaults to `'/'`.
                     * @return {String} The node path
                     */
                    getPath: function(field, separator) {
                        field = field || this.idProperty;
                        separator = separator || '/';

                        var path = [this.get(field)],
                            parent = this.parentNode;

                        while (parent) {
                            path.unshift(parent.get(field));
                            parent = parent.parentNode;
                        }
                        return separator + path.join(separator);
                    },

                    /**
                     * Returns depth of this node (the root node has a depth of 0)
                     * @return {Number}
                     */
                    getDepth : function() {
                        return this.get('depth');
                    },

                    /**
                     * Bubbles up the tree from this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the bubble is stopped.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    bubble : function(fn, scope, args) {
                        var p = this;
                        while (p) {
                            if (fn.apply(scope || p, args || [p]) === false) {
                                break;
                            }
                            p = p.parentNode;
                        }
                    },

                    //<deprecated since=0.99>
                    cascade: function() {
                        if (Ext.isDefined(Ext.global.console)) {
                            Ext.global.console.warn('Ext.data.Node: cascade has been deprecated. Please use cascadeBy instead.');
                        }
                        return this.cascadeBy.apply(this, arguments);
                    },
                    //</deprecated>

                    /**
                     * Cascades down the tree from this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the cascade is stopped on that branch.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    cascadeBy : function(fn, scope, args) {
                        if (fn.apply(scope || this, args || [this]) !== false) {
                            var childNodes = this.childNodes,
                                length     = childNodes.length,
                                i;

                            for (i = 0; i < length; i++) {
                                childNodes[i].cascadeBy(fn, scope, args);
                            }
                        }
                    },

                    /**
                     * Interates the child nodes of this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the iteration stops.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node in the iteration.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    eachChild : function(fn, scope, args) {
                        var childNodes = this.childNodes,
                            length     = childNodes.length,
                            i;

                        for (i = 0; i < length; i++) {
                            if (fn.apply(scope || this, args || [childNodes[i]]) === false) {
                                break;
                            }
                        }
                    },

                    /**
                     * Finds the first child that has the attribute with the specified value.
                     * @param {String} attribute The attribute name
                     * @param {Object} value The value to search for
                     * @param {Boolean} deep (Optional) True to search through nodes deeper than the immediate children
                     * @return {Ext.data.NodeInterface} The found child or null if none was found
                     */
                    findChild : function(attribute, value, deep) {
                        return this.findChildBy(function() {
                            return this.get(attribute) == value;
                        }, null, deep);
                    },

                    /**
                     * Finds the first child by a custom function. The child matches if the function passed returns <code>true</code>.
                     * @param {Function} fn A function which must return <code>true</code> if the passed Node is the required Node.
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the Node being tested.
                     * @param {Boolean} deep (Optional) True to search through nodes deeper than the immediate children
                     * @return {Ext.data.NodeInterface} The found child or null if none was found
                     */
                    findChildBy : function(fn, scope, deep) {
                        var cs = this.childNodes,
                            len = cs.length,
                            i = 0, n, res;

                        for (; i < len; i++) {
                            n = cs[i];
                            if (fn.call(scope || n, n) === true) {
                                return n;
                            }
                            else if (deep) {
                                res = n.findChildBy(fn, scope, deep);
                                if (res !== null) {
                                    return res;
                                }
                            }
                        }

                        return null;
                    },

                    /**
                     * Returns true if this node is an ancestor (at any point) of the passed node.
                     * @param {Ext.data.NodeInterface} node
                     * @return {Boolean}
                     */
                    contains : function(node) {
                        return node.isAncestor(this);
                    },

                    /**
                     * Returns true if the passed node is an ancestor (at any point) of this node.
                     * @param {Ext.data.NodeInterface} node
                     * @return {Boolean}
                     */
                    isAncestor : function(node) {
                        var p = this.parentNode;
                        while (p) {
                            if (p == node) {
                                return true;
                            }
                            p = p.parentNode;
                        }
                        return false;
                    },

                    /**
                     * Sorts this nodes children using the supplied sort function.
                     * @param {Function} sortFn A function which, when passed two Nodes, returns -1, 0 or 1 depending upon required sort order.
                     * @param {Boolean} recursive Whether or not to apply this sort recursively
                     * @param {Boolean} suppressEvent Set to true to not fire a sort event.
                     */
                    sort: function(sortFn, recursive, suppressEvent) {
                        var cs  = this.childNodes,
                            ln = cs.length,
                            i, n;

                        if (ln > 0) {
                            Ext.Array.sort(cs, sortFn);
                            for (i = 0; i < ln; i++) {
                                n = cs[i];
                                n.previousSibling = cs[i-1];
                                n.nextSibling = cs[i+1];

                                if (i === 0) {
                                    this.setFirstChild(n);
                                }
                                if (i == ln - 1) {
                                    this.setLastChild(n);
                                }

                                n.updateInfo(suppressEvent);

                                if (recursive && !n.isLeaf()) {
                                    n.sort(sortFn, true, true);
                                }
                            }

                            if (suppressEvent !== true) {
                                this.fireEvent('sort', this, cs);
                            }
                        }
                    },

                    /**
                     * Returns true if this node is expaned
                     * @return {Boolean}
                     */
                    isExpanded: function() {
                        return this.get('expanded');
                    },

                    /**
                     * Returns true if this node is loaded
                     * @return {Boolean}
                     */
                    isLoaded: function() {
                        return this.get('loaded');
                    },

                    /**
                     * Returns true if this node is loading
                     * @return {Boolean}
                     */
                    isLoading: function() {
                        return this.get('loading');
                    },

                    /**
                     * Returns true if this node is the root node
                     * @return {Boolean}
                     */
                    isRoot: function() {
                        return !this.parentNode;
                    },

                    /**
                     * Returns true if this node is visible
                     * @return {Boolean}
                     */
                    isVisible: function() {
                        var parent = this.parentNode;
                        while (parent) {
                            if (!parent.isExpanded()) {
                                return false;
                            }
                            parent = parent.parentNode;
                        }
                        return true;
                    },

                    /**
                     * Expand this node.
                     * @param {Function} recursive (Optional) True to recursively expand all the children
                     * @param {Function} callback (Optional) The function to execute once the expand completes
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    expand: function(recursive, callback, scope) {
                        var me = this;

                        if (!me.isLeaf()) {
                            if (me.isLoading()) {
                                me.on('expand', function() {
                                    me.expand(recursive, callback, scope);
                                }, me, {single: true});
                            }
                            else {
                                if (!me.isExpanded()) {
                                    // The TreeStore actually listens for the beforeexpand method and checks
                                    // whether we have to asynchronously load the children from the server
                                    // first. Thats why we pass a callback function to the event that the
                                    // store can call once it has loaded and parsed all the children.
                                    me.fireAction('expand', [this], function() {
                                        me.set('expanded', true);
                                        Ext.callback(callback, scope || me, [me.childNodes]);
                                    });
                                }
                                else {
                                    Ext.callback(callback, scope || me, [me.childNodes]);
                                }
                            }
                        } else {
                            Ext.callback(callback, scope || me);
                        }
                    },

                    /**
                     * Collapse this node.
                     * @param {Function} recursive (Optional) True to recursively collapse all the children
                     * @param {Function} callback (Optional) The function to execute once the collapse completes
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    collapse: function(recursive, callback, scope) {
                        var me = this;

                        // First we start by checking if this node is a parent
                        if (!me.isLeaf() && me.isExpanded()) {
                            this.fireAction('collapse', [me], function() {
                                me.set('expanded', false);
                                Ext.callback(callback, scope || me, [me.childNodes]);
                            });
                        } else {
                            Ext.callback(callback, scope || me, [me.childNodes]);
                        }
                    }
                };
            }
        }
    });