This is a TO DO document for the Uize.Widget.Button module.

	fix the bug that Ben had seen with the class names not being updated correctly in his example with radio button widgets
	performance optimization idea: only wire up additional events (click, mousedown, mouseup, mouseout) on mouseover
	double-click actions for buttons
	state->node map to allow different naming schemes? (grayed vs. dimmed, etc.)
	state->className map to allow different naming schemes
	state cumulative mode (exclusive or cumulative)