title: Flex Mobile Back Button
body: <p>I search all through the internet and all topics about taking control of the back button in views are saying same thing:</p>
  
  <pre><code>override protected function backKeyHandler():void
  {
      //Block native 'back' behavior.
  }
  </code></pre>
  
  <p>But when I write this code into my views I always taking same error:</p>
  
  <p>1020: Method marked override must override another method.</p>
  
  <p>I look for this but didn't find a solution.</p>