you need two special keys to pull the radio out. then you can access the screws that hold the surround in. Dealer may let you borrow them on the lot to pull your radio or you could buy you own.
http://www.beckerautosound.com/ click on the what's new tab. OEM Becker Radio removal keys, BNA-1184.989 ($1.76 set) Plus $5.00 small order handling fee.