title: iOS: Change interface orientation when pop view controller
body: <p>All view controllers in my app are working only in portrait orientation except one which can be portrait or landscape oriented. </p>
  
  <p>I have some usage scenario like following:</p>
  
  <ol>
  <li>I push controller which works in both orientations to UITabBarController</li>
  <li>User change orientation from portait to landscape</li>
  <li>User press "back button"</li>
  </ol>
  
  <p>After these actions application remains in landscape orientation and does not change it automatically to portrait.</p>
  
  <p>I control view controller orientation using supportedInterfaceOrientations (I use iOS 6.0). What I do wrong? How can I get correct behaviour when application automatically change orientation to allowed when user press back button? Thank you for answer!</p>