AS of right now the menu buttons have no use. The only button that was working was the "Change View" and the same functionality can be reached by using the "info"-button on your remote - you then gets a Dialog box with the option to change views.
I actually havent seen the buttons for some time, don't know if it's because I changed skins or if the updated skins just don't have them anymore. No reason that they were there, anyway, since it was just a bit confusing that there were some buttons that did absolutely nothing.
Probably their funtionality will be added at some point, and then they will revive in the skins