title: programmatically call already set UIBarButtonItem action
body: <p>I am creating what I believe will be a really sweet automated testing suite for iOS.  However, I need to be able to call a previously set action for any given UIBarButtonItem.  I can tell from the debugger that I am really dealing with a UIButton but weeks of trying different ways of getting to that action have failed.  If anyone can figure out how to call that selector I would be most pleased.</p>
  
  <p>Again I don't want to set an action I want to call an action someone else has already set.</p>