drag drop row

[Ashraf]

hi ,
kindly help me when i used drag drop in rad grid the destination grid sometimes =null 
i used this demo
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/draganddrop/defaultcs.aspx 

and args.get_destinationHtmlElement().id sometimes = the row that i selected it to drop it not the destination element 
even if  i dropped it at  the destination grid .
kindly help me ,
if i got the row index that i dropped on it i will solve my problem ,
how to get it ,
i tried all the methods
http://www.telerik.com/help/aspnet-ajax/grid-onrowdropping.html