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     <oRadioButto>:setFocus() --> self

        setFocus() is a method of the RadioButto class that is used for
        giving focus to a RadioButto object.  Upon receiving this message,
        the RadioButto object redisplays itself and, if present, evaluates
        the code block within its fBlock instance variable.

        This message is meaningful only when the RadioButto object does not
        have input focus.