title: How to fix the warning: view is not in the window hierarchy
body: <p>I'm using the standard setup procedure for <code>Mobclix</code> in an <code>iOS</code> app and I'm calling the <code>requestAndDisplayAdFromViewController:</code> method from within <code>viewWillAppear:</code></p>
  
  <pre><code>    - (void)viewWillAppear:(BOOL)animated {
      [super viewWillAppear:animated];
  
      [fullScreenAdViewController requestAndDisplayAdFromViewController:self];
  
  }
  </code></pre>
  
  <p>here's the warning I'm getting:</p>
  
  <pre><code>Warning: Attempt to present &lt;MobclixFullScreenAdViewController: 0x14f2c0&gt; on &lt;EditGameViewController: 0x1838d0&gt; whose view is not in the window hierarchy!
  </code></pre>
  
  <p>I hope that's enough to go on. thanks for any help.</p>