How do you take apart ceiling light wall switch on 03/

[jab]

I have a 03 Sun Voyager and the big switch buttons that turn on the ceiling lights don't work but the bead lights do. I am assuming it is a switch problem but I can't get it apart. There are no screws that hold the cover on and so I thought it would just pop off with some prying but no luck. Anyone know how they come apart or what my problem might be? Thanks, Jeff