      *  @private
      *  Determines how much to resize the column.
      */
-    private function columnResizeMouseUpHandler(event:MouseEvent):void
+    private function columnResizeMouseUpHandler(event:Event):void
     {
         if (!enabled || !dataGrid.resizableColumns)
             return;


        var pt:Point = new Point(event.stageX, event.stageY);
        pt = dataGrid.globalToLocal(pt);
        resizeGraphic.move(Math.min(Math.max(minX, pt.x),
                           (dataGrid.width / dataGrid.scaleX) - separators[0].width - vsw), 0);
    }


    /**
     *  @private
     * 
     *  @param event MouseEvent or SandboxMouseEvent.
     */
    private function columnDraggingMouseUpHandler(event:Event):void
    {
        if (!dataGrid.movingColumn)
            return;
