how to eliminate Gnome3 top panel

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http://askubuntu.com – I am using gnome3 with Ubuntu 12.10. I am interested in using the new Cairo Dock which seems to replace the gnome top panel. The trouble here is that the top panel overlaps the new Cairo upper docks. How do I disable the Gnome Shell top panel? I tried adding display:none to /usr/share/gnome-shell/theme/gnome-shell.css, but this accomplishes nothing. (HowTos)