Fedora :: Load Grub2 From Grub4dos / Load Directly Grub2 Core Without Passing By Bootstriping Code?

I want to load grub2 from grub4dos.I want to load directly the grub2 core. I know how to load first 512 bytes from some patition by chainloader and load grub2, but what I need is to load directly grub2 core without passing by bootstriping code (first 512 bytes).So, my first boot manager is grub4dos, then I can load grub2 and later I load Ubuntu. But I think I have to edit --set-root
What I dont know is how.

In hdd 0,7 (sda8) I have Ubuntu 10.10 and /boot/grub/core.img is in sda8 (hd0.7)

I tried this way:

Code:
title grub2
find --set-root /boot/grub/core.img
kernel /boot/grub/core.img