      *  @playerversion AIR 1.5
      *  @productversion Flex 4
      */
-    public function getHorizontalScrollPositionDelta(scrollUnit:uint):Number
-    {
-        return (layout) ? layout.getHorizontalScrollPositionDelta(scrollUnit) : 0;     
+    public function getHorizontalScrollPositionDelta(navigationUnit:uint):Number
+    {
+        return (layout) ? layout.getHorizontalScrollPositionDelta(navigationUnit) : 0;     
     }
     
     /**

     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    public function getVerticalScrollPositionDelta(scrollUnit:uint):Number
    {
        return (layout) ? layout.getVerticalScrollPositionDelta(scrollUnit) : 0;     
    }
    
    //--------------------------------------------------------------------------

     */  
    mx_internal function set hasMouseListeners(value:Boolean):void
    {
        if (_mouseEnabledWhereTransparent)
            $invalidateDisplayList();
	_hasMouseListeners = value;
    }
