title: UIBarButtonItem added to storyboard does not appear at runtime
body: <p>When I try to add a UIBarButtonItem to my UIViewController, nothing shows up at run time.</p>
  
  <p>What I did:</p>
  
  <ol>
  <li>I started off with a brand new single view project.</li>
  <li>I dragged a UIBarButtonItem into the view controller.</li>
  <li>I can now see and customize the item in the storyboard, but when I run it, there is no toolbar.</li>
  </ol>
  
  <p>Note: the Bar Button Item appears as a direct child of View Controller.</p>
  
  <p>How can I get the UIToolbar to appear?</p>