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     <oRadioGroup>:setFocus() --> self

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

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