new to Ajax - what control do I use to expand gridview with subitems

Hello experts,
I am new to the Ajax Control toolkit and need to know which control I should use. I have a .net gridView and I need to add a plus sign next to each row that will expand the gridview to show subitems upon clicking. Ideally the gridview would expand to show the subitems but a popup showing the subitems might work also. Is this possible with Ajax and what control can do this? If you can send me a link with a tutorial, that would help a lot. Thank you.
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dpiccoAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
step by step:
http://www.codeproject.com/Articles/92559/Expand-and-Collapse-for-Summary-Preview-Row-in-a-G

Ajax has nothing to do with this . . . but can help with the display and updates for performance.
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dpiccoAuthor Commented:
Thank you. This is a really interesting solution. I may go with DevExpress. They have a good way of handling master-detail gridviews. Thanks again.
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