title: iPhone hide Navigation Bar only on first page
body: <p>I have the code below that hides and shows the navigational bar.  It is hidden when the first view loads and then hidden when the "children" get called.  Trouble is that I cannot find the event/action to trigger it to hide again when they get back to the root view....</p>
  
  <p>I have a "test" button on the root page that manually does the action but it is not pretty and I want it to be automatic.</p>
  
  <pre><code>-(void)hideBar 
  {
      self.navController.navigationBarHidden = YES;
  }
  -(void)showBar 
  {       
      self.navController.navigationBarHidden = NO;
  }
  </code></pre>