I have two D10s in the same room. I want change the channel on one then switch the remote to av2 and change the channel on the other. I can't seem to get it to work. I tried program codes 1, 2, 3, and 4 but when I switch the receiver from direc to av1,av2 nothing happens? maybe I'm doing something wrong or its not possible to control two receivers with one remote. I called directtv and they said its not possible with two d10s. please help!