title: Prevent the animation when clicking "Back" button in a navigation bar?
body: <p>My application has a navigation controller and I don't want any animation in it :</p>
  
  <ul>
  <li><p>to prevent an animation when pushing a view, it's easy, via the pushViewController:animated: method</p></li>
  <li><p>but when I click the "back" button on this subview, there's an animation ! KO ! What can I do to prevent this animation ?</p></li>
  </ul>