F22 Beta 3 Gnome "Icon" "Einstellungen" does not work

Sat Apr 25 10:45:41 UTC 2015

Hi,
I want to activate my Canon printer. Should be possible via "Einstellungen", see screenshot attached, right upper corner. But I can not activate "Einstellungen". How can I activate a printer via xterm?
Anyway in my F22 system (fresh install, all updates currently loaded) it should be possible to activate the printer via a Gnome menue, or there is a bug.
Kind Regards
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