title: Position mask while rendering
body: <p>How can I position a mask loading layer and its message in the vertical and horizontal center while the view is still rendering? I want my controller to handle it. Is there another solution than masking after rendering?</p>
  
  <p>What I tried:</p>
  
  <p><code>oView.getEl().mask( "Loading..." );</code> this will be displayed before rendering is done. The message box is displayed at the top of the panel. <code>setloading</code>'s message is what I want. However:</p>
  
  <ul>
  <li><p><code>setLoading()</code> is not locked to the panel/view. If you drag the window/panel, the loading mask with message stays in the drag start and does not move with its window/panel. The loading message works perfectly <code>setLoading( 'Waiting...' );</code></p></li>
  <li><p><code>mask()</code> locks to the panel/view (yea!). But it gets displayed at the panel's top not center.</p></li>
  </ul>