[xmonad] Autohiding of the Gnome-Panel

I use xmonad and Gnome and I would like to use a gnome-panel with autohiding. But with autohiding the gnome-panel stays always behind the windows and can't be accessed. A google search only showed me a rather old bug report. I've tried avoidStruts from XMonad-Hooks-ManageDocks, but it didn't help. Is there a solution? Greetings Ralph