Zombie in KDE taskbar tray

[Victor Odhner]

There is a special section of my KDE taskbar that shows icons
for kopete, the volume control, and the resize/rotate tool.
One other app was there -- I forget which one -- and when I
shut it down it left an unresponsive gray square.

Where in the KDE structure are these items configured?
How can I get rid of this zombie?  No amount of clicking
on this non-icon brings up a menu.  Clicking in that
section of the taskbar brings up controls for the panel as
a whole but shows me nothing about the specific section,
nor offers me any options to move it around for example.

Anyone know about this?

Thanks (and Happy New Year!),

Vic