I may be wrong, but I don't think you can.
I use a Logitech Harmony 555 to control everything from one remote. Works well with all of my oddball equipment. Even works with my old Beosystem 5000, which only very few universal remotes can! I haven't yet had a look to see if it'll do the Beosystem 3000 though, but that's packed away in storage at the moment.
Quality of the remote isn't bad, but it's no B&O.