fmugur, I have a pano roof, but I'm sure the accordion parts are similar. they pressure fit (no screws/clasps) and its a joke to pull both the edges off. on bottom and top. I just did it this weekend. Its the easiest thing ever.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S