Nested gridview Concept

Question

Hi all,

I want to implement nested gridview concept gridview within a gridview...The parent gridview consists of company details.. When i select a company related contact details should be displayed in another gridview... I tried with most of the examples in net but none worked for me. I have till now tried to use collapsible panel,modalpopup control.. None of the worked as shown in net...The way i want to implement should look like this
http://http://www.codeproject.com/KB/webforms/NestedGridView.aspx..

Please help me