As Darren said, I've recently changed my later style steering wheel buttons (the ones with the star and menu buttons) to the earlier style ones, as my Golf is a early 2005 model year. Again as Darren correctly said, the older style buttons now have a "source" button the left hand set. Using this scrolls through, FM, Internal CD, CD Changer (IPod), and Aux (if switched on).
Both phone buttons on the left set work perfectly with my parrot bluetooth kit. The right hand stalk has volume up and down as well as track up/down and fast forward. The cool thing is that I don't have to be in the Audio menu of the DIS to use the track up/down/seek buttons. they are always active no matter what screen I am in. this is due to the fact that the functions on the DIS are now totally controlled by the wiper stalk and NOT the steering wheel buttons.
Cruise control works perfectly just as before the button swap too.
Works perfectly for me.
Sorry DanishMKVGTI, probably doesn't help you with your problem.
Cheers
Andrew