Event handlers are registered with
void EZ_AddEventHandler(EZ_Widget *widget,
EZ_EventHandler handler, void *data)
To remove a event handler from the event handler list, use
void EZ_RemoveEventHandler(EZ_Widget *widget,
EZ_Handler handler, void *data)
This function removes the specified event handler if both the procedure and the registered data match.
To remove all event handlers registered to a widget, use
void EZ_RemoveAllEventHandlers(EZ_Widget *widget)