      */
     private function get vsbVisible():Boolean
     {
-        var vsb:ScrollBar = getScroller().verticalScrollBar;
+        var vsb:ScrollBarBase = getScroller().verticalScrollBar;
         return vsb && vsb.visible;
     }
     

     */
    private function set vsbVisible(value:Boolean):void
    {
        var vsb:ScrollBar = getScroller().verticalScrollBar;
        if (!vsb)
            return;
        

            return;

        var viewport:IViewport = scroller.viewport;
        var hsb:ScrollBarBase = scroller.horizontalScrollBar;
        var vsb:ScrollBarBase = scroller.verticalScrollBar;
        var minViewportInset:Number = scroller.minViewportInset;
        
        var contentW:Number = 0;
