message: Removed button from bar in container
diff: - (void)removeReactSubview:(UIView *)subview
  {
  [super removeReactSubview:subview];
  + [self.buttons removeObject:((UIBarButtonHostView *) subview).button];
  + [self.reactViewController.navigationItem setRightBarButtonItems:self.buttons];
  }
  - (void)didMoveToWindow
  