message: Popped to prev controller when subview removed
diff: - (void)removeReactSubview:(UIView *)subview
  {
  + NSInteger crumb = [self.reactSubviews indexOfObject:subview] - 1;
  [super removeReactSubview:subview];
  + [_navigationController popToViewController:_navigationController.viewControllers[crumb] animated:true];
  }
  - (void)didUpdateReactSubviews
  