In VB .net Gridview control how can I add funtionality to the predefined Select button.?

For example as soon as the row is selected using the button I would like to run some logic. So basically I would like to append the code that runs behind the button.In VB .net Gridview control how can I add funtionality to the predefined Select button.?
Just trap the SelectedIndexChanged event and add your code there. (I'm using C# but I assume that handler exists in VB as well).