http://mattberseth.com/ 
Confirm GridView Deletes with the ModalPopupExtender

How To: Use the HoverMenuExtender for GridView RowCommands

没太多好说的，Matt Berseth有一系列和GridView相关的好文章


ModalPopupExtender Example: Creating an image thumbnail viewer

majordojo网站的例子挺酷，有空学一下，怎么做ModalPopupExtender动画出现的效果

ModalPopupExtender Example for Editing Rows in a GridView (Master/Detail Scenario)