title: How to Use TabBarViewController with a NavigationController
body: <p>I know I can do this</p>
  
  <pre><code> [self.navigationController pushViewController:self.someUITabBarController animated:YES];
  </code></pre>
  
  <p>And that means putting <code>UITabBarController</code> on a <code>navigationgController</code> somehow</p>
  
  <p>What about if I want <code>someUITabBarController</code> to be the first controller (the one located on the lowest level) of <code>navigationController</code>?</p>
  
  <p>I simply cannot change the <code>rootViewController</code> of the <code>NavigationController</code> into <code>someUITabBarController</code></p>