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     <oPushButton>:setFocus() --> self

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

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