title: didSelectViewController of tabBarController is not working?
body: <p>i have implemented Tab bar controller in IB.but when i write the following method in appdelegate.m , it is not called(i have put break point) when i tab ...?any help?</p>
  
  <pre><code>- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
  
  - (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
  </code></pre>