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     <oRadioButto>:killFocus() --> self

        killFocus() is a method of the RadioButto class that is used for
        taking input focus away from 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 has input
        focus.