VS 2008 - How To Popup A Panel When A Row In Gridview Is Clicked

I need to popup a modal panel on the webpage when a user clicks a row in the gridview. The only way I know how to do things with clicking rows is with the attributes.add routine like below. I do this in the RowDataBound so they can view a detail page when a row is clicked.

Code:
Dim X As Integer
For X = 0 To C1GridView1.Columns.Count - 1
Dim a As String = e.Row.Cells(1).Text.ToString
Dim b As String = e.Row.Cells(2).Text.ToString
If X > 0 Then e.Row.Cells(X).Attributes.Add("onclick", "parent.location='Detail.aspx?c=" & a & "&u=" & b & "'")
Next

I want the user to click Column 0 which can be a hyperlink or anything to show this panel. This will be for adding notes for the selected row. So I'll have to call an update afterwards. But I do need a value from the row so I know which customer this is for.