title: Can't place two buttons in NavigationItem.RightBarButtonItems in MonoTouch
body: <p>In my project, I need to add two <code>UIBarButtonItem</code>s to a <code>NavigationItem</code> of a view controller. I solved this with this code:</p>
  
  <pre>UIBarButtonItem saveButton = new UIBarButtonItem("Save", UIBarButtonItemStyle.Bordered, (sender, e) => {
      //some saving code...
      });
      UIBarButtonItem delButton = new UIBarButtonItem("Delete", UIBarButtonItemStyle.Done, (sender, e) => {
      //some deletion code...
      });
      UIBarButtonItem[] items = new UIBarButtonItem[]
      {
          saveButton,
          delButton
      };
      this.NavigationItem.RightBarButtonItems = items;
  </pre>
  
  <p>It worked in previous versions of MonoTouch (on iOS 5, both device and simulator), but (I think so) after I upgraded to MonoTouch 6, only first button from the array is displayed.
  I try to use <code>NavigationItem.SetRightBarButtonItems(items, false)</code> method, but without any effect.</p>
  
  <p>Is it a common problem or I am doing something wrong?</p>