private void validateAgainstVeto() {
    Calendar c = Calendar.getInstance(zone, locale);
    c.setTime(currentDate);
    if (vetoModel != null) {
      todayButton.setEnabled(!vetoModel.isRestricted(this, c));
      noneButton.setEnabled(!vetoModel.isRestrictNull(this));
    } else {
      todayButton.setEnabled(this.isEnabled());
      noneButton.setEnabled(this.isEnabled());
    }

  }
private void validateAgainstVeto()