>> there does not seem to be any kind of
>> radio buttons.  Could anyone tell me what to use?
>
> RadioButtonGroupMorph-nk by Ned Kontz  and RadioButtonGrpEnh-ccn.1.
> cs by
> Chris Norton do the trick.
Actually, there are radio buttons in the image. You can see an example
of these in help>preferences>halos, the code for this is in
PreferencesPanel>>haloThemeRadioButtons.
Use "ThreePhaseButtonMorph radioButton" or possibly
"UpdatingThreePhaseButtonMorph radioButton".