title: Flex AdvancedDataGrid - Remove sort arrow
body: <p>Is it possible to completely remove the sort arrows on an AdvancedDataGrid header?</p>
  
  <p>I know that you can kinda do this by using </p>
  
  <pre><code>&lt;mx:AdvancedDataGrid sortExpertMode="true"/&gt;
  </code></pre>
  
  <p>and I even tried using </p>
  
  <pre><code>&lt;mx:AdvancedDataGrid sortExpertMode="true"&gt;        
  &lt;mx:columns&gt;
      &lt;mx:AdvancedDataGridColumn sortable="false" /&gt; 
  </code></pre>
  
  <p>This doesnt work because I have an automatic sort whenever one of the group items are opened. So the grid starts of great looking like this</p>
  
  <p><a href="http://www.freeimagehosting.net/uploads/85fd6c9816.jpg" rel="nofollow noreferrer">closed group http://www.freeimagehosting.net/uploads/85fd6c9816.jpg</a></p>
  
  <p>and when we open a group we are greeted by this fiendish triangle in the header</p>
  
  <p><a href="http://www.freeimagehosting.net/uploads/3226375b08.jpg" rel="nofollow noreferrer">open group http://www.freeimagehosting.net/uploads/3226375b08.jpg</a></p>
  
  <p>Any help will be greatly appreciated.</p>