Activate/Deactivate checkbutton by program

Hello!

Can anybody tell me, how it is possible to activate or deactivate a Tk
checkbutton by program. I cannot find any switch about that.

My example:

set e [checkbutton $f.r1 -justify left -text "Test"]
pack $e -padx 5 -pady 3 -anchor sw

I'm looking for an option like "-value enabled" or "-state activated".
Does anybody know a possibility?

Thanks, Christian

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