That's one way to do it, but you could have something very similar that uses composition instead of inheritance (and a nice trait hierarchy to top it off). MyCu

That's one way to do it, but you could have something very similar that uses composition instead of inheritance (and a nice trait hierarchy to top it off). MyCustomToggleButton would contain an instance of ToggleButton and override some behavior while implementing ToggleButtonInterface or whatever. I don't know if that's the way to go but that'd work.