title: ctrl button sometimes block KEY_UP event for 'c' key
body: <p>Try the following code:</p>
  
  <pre><code>myListener = new Object();
  myListener.onKeyUp = function() {
      if (Key.isDown(Key.CONTROL) &amp;&amp; Key.getCode() == 67) {
          //Ctrl+C
          trace("Ctrl+C key down!");
      }
  };
  Key.addListener(myListener); 
  </code></pre>
  
  <p>hold <kbd>Ctrl</kbd> key and start pressing <kbd>C</kbd>. From some point you will notice that there is no KEY_UP event for the <kbd>C</kbd> key (there will also be no event for <kbd>A</kbd>,<kbd>X</kbd>,<kbd>R</kbd>,<kbd>V</kbd> and maybe more).
  For most of the button the KEY_UP event will still be dispatched. </p>
  
  <p>Why is that? Is there a solution?</p>