When i asked the dealer he said he doesnt really know. Im guessing because its a blind type and long... HMM they didnt add many things that should be there.
I find that I usually know more about the car I'm interested in than most sales person. I don't know why the sales people don't get more aquanted with the cars. In this information age especially. They should be reading the manuals when things are slow.
As long as the hvac is not off you can close all open windows including the pano roof by pressing and holding the recirculate button. In most other Mercedes this is one touch just like the sunroof. Since I usually have the pano roof and the very back windows open at the same time this works great.