         const rendererY:Number = paddingTop;
         const rendererHeight:Number = unscaledHeight - paddingTop - paddingBottom;
         const maxRendererX:Number = columnHeaderBar.horizontalScrollPosition + unscaledWidth;
+        
+        const allocatedItemRenderers:Vector.<IGridItemRenderer> = new Vector.<IGridItemRenderer>();
+        var createdItemRenderers:Vector.<IGridItemRenderer> = null;
         
         var columnIndex:int = -1;
         var visibleLeft:Number = 0;

                return freeElement;
        }
        
        const newElement:IVisualElement = factory.newInstance() as IVisualElement;
        elementToFactoryMap[newElement] = factory;
        return newElement;
    }
    
    /**

            
            column = renderer.column;
            if (column && (visibleColumnIndices.indexOf(column.columnIndex) != -1))
            {
                oldRenderers[column] = renderer;
            }
            else
            {
                freeVisualElement(renderer);
                renderer.discard(true);
            }
        }
        
        // Add all of the separators to the free-list, since laying them out is cheap
