      *  A vector of column indices corresponding to the header renderers
      *  which currently have their sort indicators visible.
      * 
-     *  @default An empty Vector.&lt;int&gt;
+     *  @default an empty Vector.&lt;int&gt;
      * 
      *  @langversion 3.0
      *  @playerversion Flash 10

    /**
     *  The IGridItemRenderer class used to renderer each column header.
     *
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.0

 *  Separators are rendered by the class specified by the <code>columnSeparator</code> property.
 *  The layout, which cannot be changed, is virtual; that means renderers and separators that have been 
 *  scrolled out of view are reused.</p>
 *
 *  @mxml <p>The <code>&lt;s:GridColumnHeaderGroup&gt;</code> tag inherits all of the tag 
 *  attributes of its superclass and adds the following tag attributes:</p>
 *
 *  <pre>
 *  &lt;s:GridColumnHeaderGroup 
 *    <strong>Properties</strong>
 *    columnSeperator="null"
 *    dataGrid="null"  
 *    downColumnIndex="-1"  
 *    headerRenderer="null"  
 *    hoverColumnIndex="-1"  
 *    visibleSortIndicatorIndices="<i>empty Vector.&lt;int&gt<i>"
 * 
 *    <strong>Styles</strong>
 *    paddingBottom="0"
 *    paddingLeft="0"
 *    paddingRight="0"
 *    paddingTop="0"
 *    separatorAffordance="5" 
 *
 *    <strong>Events</strong>
 *    gridClick="<i>No default</i>"
 *    gridDoubleClick="<i>No default</i>"
 *    gridMouseDown="<i>No default</i>"
 *    gridMouseDrag="<i>No default</i>"
 *    gridMouseUp="<i>No default</i>"
 *    gridMouseRollOut="<i>No default</i>"
 *    gridMouseRollOver="<i>No default</i>"
 *    separatorClick="<i>No default</i>"
 *    separatorDoubleClick="<i>No default</i>"
 *    separatorMouseDrag="<i>No default</i>"
 *    separatorMouseUp="<i>No default</i>"
 *    separatorMouseRollOut="<i>No default</i>"
 *    separatorMouseRollOver="<i>No default</i>"
 *  /&gt;
 *  </pre>
 *
 *  @see Grid
 * 
