NetworkManager remembers old DUN connections, no UI way to get rid of them

[Steve White]

This is Ubuntu 12.04 on a Samsung NC-20.

I introduce my phone as a DUN device via the Bluetooth applet's "Set Up New Device..." wizard.

I have had reason to do this several times. (a separate bug, actually)

Every time I did, a new item would appear in the nm-applet menu, showing (evidently) another copy of the same device.
I saw no way to get rid of these items. (This includes removing the phone using the Bluetooth Manager control panel.)

Turns out, these items correspond to files in
    /etc/NetworkManager/system-connections
so the work-around is to look through those files, and carefully remove the unwanted ones.

But there should be a GUI way, preferably through the NetworkManager applet, to "forget" these unwanted connections.

Thanks!