i just bought a 2007 audi a4 20T from a Volvo Dealer.

i see in the manual that the car has a bunch of functions you can navigate through on the gauge cluster using the small buttons on the windshield wiper control arm. My display shows my "Miles to empty" and the tempature but i cant scroll becuse there are't any buttons on my wiper control arm.

So can i buy and install the buttons (or a wiper control arm with buttons) or is there something deeper...do i need some kind of vehicle computer upgrade/install?

Thanks