Why can't I hide my button - but I can hide my view?

I have a view called MainView and a button connected to an outlet and method "ChangeBarButton"
-(IBAction)ChangeBarButton:(id)sender
[MainView setHidden:YES];
[ChangeBarButton setHidden:(YES];
I get an autocomplete for "setHidden", but whenever I click the button, my view disappears while the button remains. There are no errors or warnings.. any idea?
Also, whenever I added the button to the interface, I dragged it onto my view.. so shouldn't it become a sub-view of MainView and hide with just [MainView setHidden:YES]?

Simple mistake.. it had an event connected but the outlet wasn't. Sorry for the clutter.

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Why can't I hide my button - but I can hide my view?

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