If you use Networkmanager and multible network connections in BE::Shell it could be that you are missing an applet for it.
But you can take network manager from GNOME (tested in Kubuntu 12.04):
1. Install network-manager-gnome
2. run nm-applet from runner (or krunner (alt+F2) if it is not disabled)
that's it! If you test it in other distributions, please give me feedback!