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This is the code for the button template. Again its got the dojoAttachPoint attribute, but its also got dojoAttachEvent. This is based on the DOJO event system. the dojoAttachEvent property gives us a mapping between what the DOM Node's event name is (onClick) and what logical action to take as a result (bind). This is how the the dojo widget code itercepts the button click code and calls the bind function.

Ok so now you can see how dojo intercepts calls to the real button click, and calls the bind funciton in your widget code. You could do most anything in this method. But in this case the bind function is defined in Bind.js which is the super JS inherited file to BindButton.js.

Hopefully this combined with the DOJO references is enough to get you up to speed.