title: UINavigationController navigationBarHidden
body: <p>Hey everbody, i'm having problem with a simple question.</p>
  
  <p>I have a NavigationController, 01.xib ans 02.xib. 
  I set in IB NavigationController to dont display the navigationBar. Well, when i go to 02.xib, i set it to appear.</p>
  
  <pre><code>[self navigationController].navigationBarHidden = NO;
  </code></pre>
  
  <p>Everything works fine.</p>
  
  <p>But, when i come back to 01.xib with the top button, the bar still appearing in the 01.xib.</p>
  
  <p>How can i fix that?</p>
  
  <p>Thanks!</p>