Dish Network remote won't change AV inputs.

Well, I successfully programmed my Dish Network Remote (A black one, not one of those fancy silver ones with all the pretty buttons) onto my new Vizio TV. It works great, as far as changing channels and changing volume, etc. The only problem I have run into is that when I press the Tv / Video button on the top left hand corner (Which switched AVs on my other TV), it doesn’t change the input but instead it mutes the TV. My question is, how can I change the programming, or whatever it may be, to the point where I can change the input? Any help would be greatly appreciated.