UpdatePanel, GridView, and PostBack

I have what I think is a fairly common scenario.  I'm implementing ATLAS into my current web application.  I've added an UpdatePanel around my GridView.  Everything is great, except I have a ButtonField that executes some server-side code and causes a PostBack.  This is desired, I've got a few things going on here and want the PostBack, but the UpdatePanel wants to do its thing and stops the PostBack from occuring.

Is there any way to bypass this?  Or... what are my alternatives?  Do I have to abandon the UpdatePanel and all the rich features it just added for me?

Thanks for your assistance.