          */
         public function get verticalScrollPosition():Number
         {
-            return ScrollBarModel(vScrollBar.model).value;
+            return _vScrollBarModel.value;
         }
         
         /**

         */
        public function get maxVerticalScrollPosition():Number
        {
            return ScrollBarModel(vScrollBar.model).maximum - 
                ScrollBarModel(vScrollBar.model).pageSize;
        }
        
    

			return _strand as IUIBase;
		}
		
        private var _vScrollBarModel:ScrollBarModel;
        private var _vScrollBar:ScrollBar;
        
        /**
