How to add CB to existing ubuntu uefi system?

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http://crunchbang.org – I have a working Ubuntu uefi-install(12.10). My hdd is partioned with gpt and the efi-partition is on "sda1", and I have a bios-grub partition at "sda2". Ubuntu is installed and is booting perfectly in uefi-mode, and obviously has everything in place, like uefi-firmware and bootloader. I then installed Crunchbang the usual way, in legacy-mode, and grub is written to mbr/sda. My bios lets me enable legacy boot support, but still look for uefi first. This way I`m able to boot my system the usual way, by choosing to boot from hdd/mbr in the boot-menu, and then I get the old gr (HowTos)