[flexcoders] dragSource in dragOver Handler changes during drag?

[Tracy Spratt]

In a dragOver handler function I want to access the data being dragged:
    var ds:DragSource = event.dragSource;
    var items:Array = ds.dataForFormat("treeItems") as Array;
    var xmlItemSource:XML = XML(items[0]);
    trace(xmlItemSource.toXMLString());

The trace displays different nodes depending on what I am dragging over.
I expected the dragSource data to always be the data currrently being
dragged.

Am I misunderstanding dragSource, or do I maybe have some other problem
that is messing things up?

Tracy