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There is little icon in the middle on touchpad, once you press it small window pops up on right screen and then you can scroll through media/radio (if you don't do anything it will close down after few moments).
I disable the TouchPad because it is too sensitive. And that middle button does not function with the TouchPad disabled. Damn, I wish I just had a forward and backward button. I'll say it again, that air conditioning menu button is perfectly suited to this task.