Expandable panel inside a GridView Project By AmauriRodrigues Converted to VB. Original project: http://www.codeproject.com/Articles/160773/Expandable-Rows-in-GridView
This article shows how to add functionality to the ASP.NET GridView control to allow the display of master/detail records with expanding rows. It probably isn't suited to scenarios where large number of records will be returned at a time.