I installed gnome-shell from the Ubuntu Gnome-Shell Remix ppa with Ubuntu 12.04. I tried rhythmbox and liked it. Since i want to use my top right panel as a system manager (halt, sound, battery and network only) and my bottom right panel as my hidden app manager (like the systray used to do) I was happy to find a rhythmbox icon with a gnome-shell menu to manage my music and the software in my bottom panel.
Unluckily, i clicked on some sort of "Hide" in this menu and I never saw my rhythmbox icon again. I would like to restore it, because rhythmbox does not exit when pressing the X button and then I can't manage it, i have to relaunch it. How can I restore this button ? I tried to remove the config files and reinstall but I don't have this pretty useful icon.
Also, is there a way to change default applications in gnome-shell ? I can't find an option dialog for it like I had in Xfce and ol'Gnome.