title: Flex 4 headerWordWrap in AdvancedDataGridColumn does not work
body: <p>I have tried various options to get headerWordWrap to work with an AdvancedDataGridColumn.  I've even tried using headerWordWrap as a property in the AdvancedDataGrid.  Nothing works. Does anyone know how to resolve this?
  Any help would be very much appreciated:</p>
  
  <pre><code>&lt;mx:AdvancedDataGrid
      id="gridAvailableQuals"
      width="100%"
      height="100%"
      dataProvider="{this.handler.qualCodes}"
      doubleClickEnabled="true"
      dragEnabled="true"
      dropEnabled="true"
      dragMoveEnabled="true"
      allowMultipleSelection="true"
      variableRowHeight="true"
      horizontalScrollPolicy="auto"
      headerWordWrap="true"
      itemDoubleClick="this.shtlQuals.addOneItem()"&gt;
  
  &lt;mx:AdvancedDataGridColumn
      headerText="Item Code"
      dataField="code"
      width="50"
      headerWordWrap="true"&gt;
  </code></pre>