         if (event.property == "horizontalScrollPosition")
             horizontalScrollPosition = Number(event.newValue);
     }        
-    
-    //----------------------------------
-    //  overlayGroup
-    //----------------------------------
-    
-    [Bindable("overlayGroupChanged")]
-    
-    private var _overlayGroup:Group = null;
-    
-    /**
-     *  The container for columnSeparator visual elements.  By default it's an 
-     *  element of the GridColumnHeaderGroup's overlay.
-     * 
-     *  @langversion 3.0
-     *  @playerversion Flash 10
-     *  @playerversion AIR 1.5
-     *  @productversion Flex 4.5
-     */
-    public function get overlayGroup():Group
-    {
-        return _overlayGroup;
-    }
-    
-    /**
-     *  @private
-     */
-    public function set overlayGroup(value:Group):void
-    {
-        if (_overlayGroup == value)
-            return;
-        
-        _overlayGroup = value;
-        invalidateDisplayList();
-        dispatchChangeEvent("overlayGroupChanged");
-    }
-    
-    //----------------------------------
-    //  separatorMouseWidth
-    //----------------------------------
-    
-    [Bindable("separatorMouseWidthChanged")]
-    
-    private var _separatorMouseWidth:Number = 5;
-    
-    /**
-     *  Horizontal space on either side of a column separator that's considered to be 
-     *  part of the separator for the sake of mouse event dispatching.
-     * 
-     *  <p>Separators are often just one pixel wide which makes interacting with them difficult.
-     *  This value is used by <code>getSeparatorIndexAt()</code> to give separators a wider
-     *  berth, so that separator events are dispatched when the mouse is closer than 
-     *  <code>separatorMouseWidth</code> to the horizontal midpoint of a separator.</p> 
-     * 
-     *  @default 5
-     * 
-     *  @langversion 3.0
-     *  @playerversion Flash 10
-     *  @playerversion AIR 1.5
-     *  @productversion Flex 4.5
-     */
-    public function get separatorMouseWidth():Number
-    {
-        return _separatorMouseWidth;
-    }
-    
-    /**
-     *  @private
-     */
-    public function set separatorMouseWidth(value:Number):void
-    {
-        if (_separatorMouseWidth == value)
-            return;
-        
-        _separatorMouseWidth = value;
-        invalidateDisplayList();
-        dispatchChangeEvent("separatorMouseWidthChanged");
-    }
     
     //----------------------------------
     //  visibleSortIndicatorIndices

        
        layout = new GridColumnHeaderGroupLayout();
        layout.clipAndEnableScrolling = true;
        
        overlayGroup = new Group();
        overlayGroup.layout = new LayoutBase(); // no layout
        overlay.addDisplayObject(overlayGroup);
        
        // Event handlers that dispatch GridEvents
        
        MouseEventUtil.addDownDragUpListeners(this, 

//--------------------------------------

/**
 *  Horizontal space on either side of a column separator that's considered to be 
 *  part of the separator for the sake of mouse event dispatching.
 * 
 *  <p>Separators are often just one pixel wide which makes interacting with them difficult.
 *  This value is used by <code>getSeparatorIndexAt()</code> to give separators a wider
 *  berth, so that separator events are dispatched when the mouse is closer than 
 *  <code>separatorMouseWidth</code> to the horizontal midpoint of a separator.</p> 
 * 
 *  @default 5
 * 
 *  @langversion 3.0
 *  @playerversion Flash 10
 *  @playerversion AIR 1.5
 *  @productversion Flex 4
*/
[Style(name="separatorAffordance", type="Number", format="Length", inherit="no")]

/**
 *  Bottom inset, in pixels, for all header renderers. 
 * 
 *  @default 0
