title: Back button not appearing on UINavigationController
body: <p><strong>I have a UINavigationController setup in my AppDelegate:</strong></p>
  
  <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {          
      // Add the navigation controller's view to the window and display.
      [self.window addSubview:navigationController.view];
      [self.window makeKeyAndVisible];
  
      return YES;
  }
  </code></pre>
  
  <p><strong>In my RootViewController I am pushing another view onto the stack:</strong></p>
  
  <pre><code>//Show the deals
      DealViewController *dvc = [[DealViewController alloc] initWithNibName:@"DealViewController" bundle:nil];
      [self.navigationController.navigationBar setHidden:NO];
      [self.navigationController pushViewController:dvc animated:YES];
  </code></pre>
  
  <p>The view shows up, but there is no back button that is added to my navigation bar. Why is this and how can I resolve it?</p>