How to group multiple rows in GridView

Hi, I have a GridView that will have about 3 rows for each customer number. I want to group those 3 rows into 1 row where the customer number will span all 3 rows, then the other details will show up on each of the 3 rows, and the final column should have a link button that spans the 3 rows.  I also want to use an AlternatingRowStyle for each group of rows (like the 1st customer with its 3 detail rows should be white, then the next customer with its 3 detail rows should be blue, and so on).  I would like the rows to look like the example below with the section for Cust No 1 colored white, and the section for Cust No 2 colored blue, etc.  Is there a way to do this?  Thanks for your help!

 Cust No 1  Relationship Name 1   Amount  LinkButton
                  Relationship Name 2   Amount
                  Relationship Name 3   Amount
Cust No 2   Relationship Name 1   Amount  LinkButton
                  Relationship Name 2   Amount
                  Relationship Name 3   Amount