Hello,

you can only bind numeric fields to the optiongroup ..
but you can subclass the optiongroup and build your own that is capable of handling boolean values

e.g.

Optgroup:Init
THIS.AddProperty('cControlSource',THIS.ControlSource)
THIS.ControlSource = ''

Optgroup:Refresh
THIS.Value = IIF(EVALUATE(THIS.cControlSource),1,2)

Optgroup:InteractiveChange
REPLACE (JUSTEXT(THIS.cControlSource)) WITH (THIS.Value=1) IN (JUSTFNAME(THIS.cControlSource))

Optgroup:ProgrammaticChange
REPLACE (JUSTEXT(THIS.cControlSource)) WITH (THIS.Value=1) IN (JUSTFNAME(THIS.cControlSource))

you may need to make some small adjustments .. but this should get you started ..

Regards
Christian