KDE Network icon disappeared

[Timothy Murphy]

I'm running Fedora-17 KDE.
The network icon in the system tray in my panel
has disappeared, and is not listed among hidden icons.

This happened once before, and I seem to recall
that some kind soul told me how to recover the icon.
I tried yum-reinstalling NetworkManager
(and kde-plasma-networkmanagement-libs)
but that didn't seem to do the trick.

Any enlightenment gratefully received.