Advanced Data Grid - Drag and Drop

Question

I have a drag and drop enabled Advance Datagrid that is
populated by an arraycollection. Although it is not shown below,
each object within the arraycollection has the attribute "GroupID"
and based on that id is associated to a group using the
GroupingCollection. Dragging and dropping a row from one grouping
to the another grouping works great - i.e.if Row2 from GroupA is
dragged and dropped into GroupB.
The problem is that I need to update the database to reflect
the change as well. In order to do that I have to capture the
GroupID value that is associated with the new group - in this case
GroupB. Unfortunately, this is where I am stumped and need some
help. Any help would be greatly appreciated.
GroupA (GroupID = 1)
-- Row1
-- Row 2
GroupB (GroupID = 2)
-- Row1
private function dragHandler(e:DragEvent):void{
var dg:AdvancedDataGrid = AdvancedDataGrid(e.currentTarget);
//Get GroupID of new grouping
//Call webservice and udpate database
//Refresh datagrid

Answer 1

I haven't worked with ADG and reag/drop, but with regular DG:
var iTargetIndex:int = dg.calculateDropIndex(e);
With the index you can find the item in the dataProvider.
Tracy