BarButtonItem
super: UIBarButtonItem (on iOS)
A button specialized for placement on a toolbar or navigation bar.
Events
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Load() This event is called when the object becames available in the current runtime system.
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Action() This event is called when a touch is released (touch-up) inside the bounds of the button
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Unload() This event is called when the object has been removed from the current runtime system (but not yet deallocated).