You do not want your receiver to control the Tivo, rather the other way around. Use the IR blaster which plugs into the back of a not-2-tuner Tivo and to the IR window of the receiver.
TiVo HD 1TB (157 HD Hrs, PLS, "S3HD")
Roamio, Oh Roamio!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!