[flexcoders] Flex tree dropIndicator?

[maikelsibbald]

How can I get a reference of the "dropIndicator"? 

override public function showDropFeedback(event:DragEvent):void{
...
        //position drop indicator
        dropIndicator.width = listContent.width - indent;
        dropIndicator.x = indent + vm.left + 2;
                if (_dropData.emptyFolder)
                {
                        dropIndicator.y += _dropData.rowHeight / 2;
                }
    }