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I'll answer it even though the thread is old. It looks like the same system that BMW used on the E36 and E46, and i've had those apart several times. The black plastic panel has two rails inside it. The white plastic clips slide into these rails and then you clip (push) the assembly back onto the door frame. What often happens (like in the case above) is that the plastic panel gets lifted up and the rails give a little (they are only made of plastic) and the white clip is removed from the guide and left in the hole on the door frame. Don't try and hit the panel back onto the clip - this will just break the guides!
Take care when removing the panel - the clips are held in so tightly that they often break off when removing the panel anyway. Either that or the rails break. Luckily the parts are cheap to replace.
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