The nm-applet in NetworkManager-gnome-0.7.0-0.3.svn2983.fc8 always has the
"Connect to Other Wireless Network" option greyed out, preventing the user from
connecting to a hidden network.
Should be all hooked up now, can you test with svn3016 from koji?
Dialogs work for me, but there's no hidden networks for me to test with (that I
know about..) so I can't confirm that it does the right thing.
But this bug was soley about the GUI, so that's sufficient.