         visibleRenderersBounds.top = rendererY;
         visibleRenderersBounds.height = rendererHeight;
         
-        // Call prepare on renderers.
-        if (createdItemRenderers)
-        {
-            for each (var createdRenderer:IGridItemRenderer in createdItemRenderers)
-                createdRenderer.prepare(false);
-        }
-        
-        for each (var allocatedRenderer:IGridItemRenderer in allocatedItemRenderers)
-            allocatedRenderer.prepare(true);
-            
         // We may have created new renderers or changed their visibility.  Force
         // validation to avoid a display list flash.
         

            
            if ((rendererX + rendererWidth) > maxRendererX)
                break;
            
            // allocate and layout a column separator
            

        const rendererHeight:Number = unscaledHeight - paddingTop - paddingBottom;
        const maxRendererX:Number = columnHeaderGroup.horizontalScrollPosition + unscaledWidth;
        
        var columnIndex:int = -1;
        var visibleLeft:Number = 0;
        var visibleRight:Number = 0;
