The window's title? The image's third coordinate? The number of messages? The y-offset of the last message?

    {"window": {"title": "Sample Widget","width": 500,"height": 500},"image": {"src": "images/logo.png","coords": [250,50,350,400 ],"alignment": "center"},"messages": [{"text": "Save","offset": [10,30]},{"text": "Help","offset": [0,50]},{"text": "Quit","offset": [ 30,10 ]} ],   "debug": "true"}