Can we change in SDK files ?

Hello,

I am using Flex SDK 4.0.0 in my Web application.

I have face one issue with Advanced Data Grid.

When i have given variable row height and row height will be set in Advanced Data Grid Column renderer .

But when i have scroll vertically then AdvancedDataGridBaseEx class throw an error for null reference object.

I have found that measuringObjects is null in below function.

mx_internal function getMeasuringRenderer(c:AdvancedDataGridColumn, forHeader:Boolean, data:Object):IListItemRenderer

    {

        var factory:IFactory = columnItemRendererFactory(c,forHeader,data);

        var item:IListItemRenderer = measuringObjects[factory];

        if (!item)

        {

            item = columnItemRenderer(c, forHeader, data);

            item.visible = false;

            item.styleName = c;

            listContent.addChild(DisplayObject(item));

            measuringObjects[factory] = item;

        }

        return item;

    }

While i am checking in Flex SDK 4.6.0, i have found that null measuringObject is track and solved.

mx_internal function getMeasuringRenderer(c:AdvancedDataGridColumn, forHeader:Boolean, data:Object):IListItemRenderer

    {

        var factory:IFactory = columnItemRendererFactory(c,forHeader,data);

  if (!measuringObjects)

          measuringObjects = new Dictionary(false);

        var item:IListItemRenderer = measuringObjects[factory];

        if (!item)

        {

            item = columnItemRenderer(c, forHeader, data);

            item.visible = false;

            item.styleName = c;

            listContent.addChild(DisplayObject(item));

            measuringObjects[factory] = item;

        }

        return item;

    }

=> I don't want to use Flex SDK 4.6.0.

=> can i directly update in Flex SDK 4.0.0 AdvancedDataGridBaseEx class ? ( i have done but it is not working)

=> can any one have solutions ?

Thanks,

Mohit