I have just implemented drag drop of child rows within a master/child datagrid based on an object model . After performing the drop the row selectors seems to point to the wrong rows. I.e. if I start with Master1(ChildX,ChildY) Master2(ChildP,ChildQ) and drag to the new order  Master1(ChildP,ChildX,ChildY) Master1(ChildY)  and then ...