private String getCheckWithdrawEnabledText() {
        String first = passiveRadioButton.isSelected() ? REQ_LABEL + WITHDRAWN_LABEL : ACK_LABEL + WITHDRAWN_LABEL;
        String second = passiveRadioButton.isSelected() ? ACK_LABEL + ASSERTED_LABEL : REQ_LABEL + WITHDRAWN_LABEL;
        return  first +  " must be enabled after " + second;
    }