Formatting a MBR drive to GUIDE in Recovery Mode?

[bjornbjorn]

Hi!

I've totally screwed up:

And I now have a Macbook Pro with a wiped boot-drive formatted in Master Boot Record, MBR. Which means I can't install a fresh version of OSX on this drive, that requires GUID. The partition tab of this drive in Disk Utility is now greyed-out and I can't re-format the drive in GUID.

Any way to re-format the drive to GUID using terminal or any other tools available in Recovery Mode?

What are other possible solutions?

Thanks for your help,

Bjorn