[grub2 newbie] Chainload grub-legacy from grub2

[Issac Goldstand]

Hi all,
  I am trying to use grub2 to boot from an iso image.  The iso is for a
live cd which in turn runs grub-legacy.  I've gotten the loopback
figured out (awesome feature!!!) but can't get the old grub-legacy to boot.

Currently, I do:
loopback cd (hd0,1)/path/to/image.iso
root=(cd)
chainloader +1

But I get
error: invalid signuature.

Am I missing something?

  Issac

(PS - I saw that initial gfxterm support is forthcoming.  Vesa++)