title: Fit TitleWindow to contents
body: <p>If I don't specify width and height values for a <code>TitleWindow</code>, it will be resized to fit it's contents when I show it using <code>PopUpManager</code>.</p>
  
  <p>But there are moments when some components inside will be resized, like a <code>ComboBox</code> which <code>dataProvider</code> is loaded asynchronously, or another component which was not visible and I'd like to set it's <code>includeInLayout</code> to <code>true</code>.</p>
  
  <p>In those moments, I'd like to tell the TitleWindow to resize itself to fit window contents. I've tried calling <code>invalidateSize()</code> and <code>invalidateDisplayList()</code> with no success.</p>
  
  <p>Is there a way to do this?</p>