title: iOS - removeFromSuperview crashes the app sometimes
body: <p>I have a page with a back button that takes me to an inbox. I do this in viewWillDisappear - </p>
  
  <pre><code>-(void)viewWillDisappear:(BOOL)animated
  {
  [super viewWillDisappear:animated];
      [inboxToolbar removeFromSuperview ];
  [inboxToolbar release];
  </code></pre>
  
  <p>}</p>
  
  <p>If I do this a few times, the app crashes and the exception thrown is "unrecognized selector sent to instance". This happens very intermittently. Any thoughts on how to go about fixing / debugging it?</p>