title: how to modify title and badge icon in UITabBarController
body: <p>I have the following code:</p>
  
  <pre><code>tabBarViewController = [[TabBarViewController alloc] init];
  mvc = [[MapViewController alloc] init];
  tvc = [[TableViewController alloc] init];
  tabBarViewController.viewControllers = [NSArray arrayWithObjects: tvc, mvc, nil];
  </code></pre>
  
  <p>However, when opening up in the simulator, I don't see any title or badge for these two UITabBar. How can I assign title and badge to these two ?</p>