Nested GridView Reordering

[Jason]

Hi

I have a GridView (1) with expandable rows.  When a row is expanded it shows a tab control.  On the second tab is another GridView (2).  

Drag and Drop works on the GridView (1) but not on the GridView (2).

They both display collections of different objects.  On GridView (2) when I drag it's okay...but when I drop an error shows that it is expecting an object of type that is displayed in GridView (1).  I am not sure how to put this right.

Please help.