title: NSMenu with IBAction method for clicking the menu header?
body: <p>How can I capture the selection of a NSMenu header with an IBAction method created in connection with interface builder?  I am not sure "header" is the right word so see the image below:</p>
  
  <p><a href="https://i.stack.imgur.com/G34OU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/G34OU.jpg" alt="alt text"></a><br>
  <sub>(source: <a href="http://physle.com/images/NSMenu.jpg" rel="nofollow noreferrer">physle.com</a>)</sub>  </p>
  
  <p>Is it possible to create an action for this the way you can with the selection of regular NSMenuItems?  I can create the relationship in interface builder but the method never fires.</p>