I did what MRBMWX5 did too. Not hard, but its not fun putting the key back together and gluing it back together as I used a silicone to make it water proof again and at the same time tried NOT to get the black silicone everywhere. I ended up with a great/perfect result but not without my fair share of cuss words and re-do's. I wanted to make sure it fit back perfectly.

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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