             
         // create a new renderer
 
-        const columns:IList = columns;
+        const columns:IList = columnsView;
         if (!columns || (columns.length <= columnIndex))
             return null;
         const column:GridColumn = columns.getItemAt(columnIndex) as GridColumn;

     */
    private function updateRendererHeights(inUpdateDisplayList:Boolean = false):void
    {
        const columns:IList = this.columnsView;
        rendererHeights.length = (columns) ? columns.length : 0;
        
        var newHeight:Number = 0;

        if (!gridColumnHeaderGroup || !grid)
            return null;
        
        const columns:IList = columnsView;
        const columnsLength:int = (columns) ? columns.length : 0;
        
        if (columnIndex >= columnsLength)
