title: doClick on an invisible button
body: <p>Can I call <code>doClick</code> on a button after making it invisible.<br>
  like:</p>
  
  <pre><code>StopBtn.setVisible( false );
  StopBtn.doClick();
  </code></pre>
  
  <p>will <code>doClick()</code> still do its work?</p>