protected void widgetZoneChanged(TimeZone zone) {
    classicPanel.setZone(zone);
    modernPanel.setZone(zone);
    gridPanel.setZone(zone);
    headerPanel.setZone(zone);
    auxPanel.setZone(zone);
    numberOfWeekPanel.setZone(zone);
  }
protected void widgetZoneChanged(TimeZone zone)