W2k3 AD: Add Enterprise Admins to Domain Admins

Howdy!

Running a Windows 2003 Native AD. Have A forest with two trees. I am trying to add the Enterprise Admin group from the Forest domain into each of the Domain Admins group on the tree domains.

Doing this through standard AD Users and Groups MMC will not work. I can add enterprise admins into all the other standard domain groups (DHCP Admins, DNS Admins, Domain Users, Backup Operators, etc..), but not the Domain Admins.

Anyone know of a way to do this, or if MS did this by design in 2k3 (Swear I could do that in 2k with no probs)?

Thanks!