Get the Button Mapper app and change the DVR button (or any button of your choice) to open the Channels App (you will probably want to also make the same button double pressed bring you home). Once inside the Channels app, all the functions work as normal and expected.
Just a heads up that TiVo screwed a lot of things up and long presses mostly no longer work in Button Mapper, just single presses and double presses. I could take some screen shot of my setup tomorrow if you need additional help.