[xmonad] How to give focus to gnome panel?

Hi helpers, I run Xmonad with Gnome on Archlinux. The usual shortcut Ctrl-Alt-Tab that gives focus to the Gnome panel does not work (I suppose it is a Metacity shortcut). Does anyone know how to configure Xmonad to do that ? In xmonad-contrib in Desktop.Gnome there is not function to give focus to the panel, what could I use instead ? Thanks, Eric