title: My UITabBarController's didSelectViewController method is not getting called?
body: <p>Here is my code stub for my app-delegate.m -- it never gets called.</p>
  
  <pre><code>- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
      NSLog(@"%s", __FUNCTION__);
  }
  </code></pre>
  
  <p>It is defined in this app-delegate.h</p>
  
  <pre><code>@interface OrioleAppDelegate : NSObject &lt;UIApplicationDelegate, UITabBarControllerDelegate&gt; {
      UIWindow *window;
      UITabBarController *tabBarController;
  }
  
  @property (nonatomic, retain) IBOutlet UIWindow *window;
  @property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
  
  @end
  </code></pre>