I'm not sure I can help. Comcast has their own programmed codes that support many features from many manufacturers - but not necessarily all features from all manufacturers. Since they have the ability to program their remotes, and some remotes can "learn", you might want to call and see if they can help you program the button you're looking for. In some cases, they can do it over the phone. In some cases, it may require the expertise of a tech, and in some cases it will not be possible.

But I would recommend at least asking your cable provider.