This, and the two icons in the dock issue which has resulted in an even more vocal uprising have resulted in my not only uninstalling PD10, but also returning it for a refund (fortunately I was within the time limit for a refund to be claimed). I'm now evaluating VMWare Fusion, which not only seemed to migrate my VM with no problem, but also allows me to run it with no control centre type application cluttering up my screen, and only one icon in the dock.
Parallels, you've got 15 days left to win me (and I'm guessing, many, many others) back as customer - make both of these "features" optional. If you are unwilling to do this (and it would be an unwillingness, rather than an inability, given that neither of these were in PD9), I'll purchase VMWare (they have a pretty good crossgrade pricing) and be gone from Parallels for good.
The clock is ticking.....