Keep Nested Child GridView Expanded in updatepanel on PostBack in ASP.Net

Hii Mudassar Khan,

I am using your nested gridview from www.aspsnippets.com. 

Thanks so much, Mudassar for posting them as they are the easiest implementation of nested gridviews that I have seen!

I follow this link http://aspforums.net/Threads/754635/How-to-keep-Nested-Child-GridViews-Expanded-across-PostBack-in-ASPNet/

to solve my problem.

Your code is useful and perfect for me.but my gridview and button are inside update panel.

So Nested Child GridViews is not remain Expanded on postback.Please suggest me where should i need to do change to remain child gridview epanded on postback.