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dhtmlx widows user button event

I am having trouble attaching events to user buttons. I was able to successfully add a button to the window using the following code:
dhxWins.window(id).addUserButton(id, position, tooltip, name);

Next I tried to attach an event to the button using this code:
dhxWins.window(id).button(id).attachEvent("onClick", handler);

When this line of code is initialized the handler is executed (not the desired behavior), but the event is not attached. Nothing happens when the new button is clicked. (Other than the visual change defined in the css).

Please tell me what js files are required for these methods, an example/sample of the user button in use would be very helpful.
Any suggestions why this code is not working correctly?