How do I display multiple rows in a single column within the SQL Server 2005?

Sample Data

-----------------------------------------------------
Cust Name Cust_Order
------------------------------------------------------
ABCD ------ Calculator
ABCD ------ Radio
ABCD ------ TV
EFGH ------ Radio
IJKL ------ ...

How do I trigger a single or double-click events when a user clicks a column within the gridview. I want the event to trigger and open a pop-up page related to the selected column.

There are no single/double-click events by default but I read you can use Gridview extended controls but not familiar with these methods. I'm open to any other methods or solutions that would enable me to achieve my results.

Sample Gridview...