With Gnome 3 shipped with Fedora 15, the menu “electronics” is no longer available on Fedora 15’s gnome-menu.
It was rather annoying for me, as this custom “Electronics” menu remained the first thing that non-linux users would look at if they want to embrace Free(Fedora) Electronic Lab.
Finally, I found how to fix it. It seems that the directory /etc/xdg/menus/application-merged became /etc/xdg/menus/application-gnome-merged.
$ mkdir /etc/xdg/menus/applications-gnome-merged
$ ln -s /etc/xdg/menus/applications-merged/electronics.menu /etc/xdg/menus/applications-gnome-merged/electronics.menu
The “electronics-menu” package will soon be updated to reflect this fix on Fedora 15.