In the HD-DVD add-on manual it says it is only for televisions/MCE/360 wont work with things like that but I guess its worth a shot, try the automatic way by holding down ok/tv at the same time and then wait for the numbers only to light up and then keep pressing channel up and down until it shuts off and then push TV button again.
Thanks, but maybe I need to rephrase this somehow. I have the universal remote that came with my DIRECTV DVR. I want to program it to control the xbox 360 dvd functions, not the xbox 360 universal remote to control my dvr functions. I was able to program it (directv remote) to use on the original xbox but can't seem to find a code for the xbox 360. Just wondering if possible and if there is a code to program it with. From the looks of it so far, Microsoft is forcing you to buy their remote.
The codes for the Xbox 360 are probably newer than the remote you have and it would be up to DirecTV (or the manufacturer of the box) to put those into your remote. If they're not already built-in, you won't be able to add them. That Logitech remote is a great replacement for your PVR remote and all your other remotes too.