http://www.axelscript.com/2008/03/26/creating-a-dragimage-from-your-uicomponent/
This is a blog post a friend of mine wrote about this. Specifically you want
this method:
public function getUIComponentBitmapData( target : UIComponent ) : BitmapData
{
var
Jake,
I cannot use bitmapdata because i'll have to use an instance of itemrenderer
which will have some different display behavior when used as proxy.
I've managed to get a transparent bg, I had to set explicitly in css class
applied to the *list* (because proxied itemrenderer use
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