title: iPhone SDK: How to access a ViewController nested in a TabBar from MyAppDelegate?
body: <p>I'm trying to call a method in my FirstViewController that is the File Owner of the first View in a TabBar.</p>
  
  <p>I've tried using this line of code but just get the error "No '-showData' method found":</p>
  
  <pre><code>[[tabBarController.viewControllers objectAtIndex:0] showData]
  </code></pre>
  
  <p>But the log says that
      [tabBarController.viewControllers objectAtIndex:0]
  is my FirstViewController:
      </p>