public void RemoveZone(Zone zone)
		{
            DeviceConfiguration.Zones.Remove(zone);
			zone.OnColorTypeChanged();
            foreach (var device in zone.DevicesInZone)
            {
                device.Zone = null;
                device.ZoneUID = Guid.Empty;
                device.OnChanged();
            }
			var devicesInZoneLogic = new List<Device>(zone.DevicesInZoneLogic);
			foreach (var device in devicesInZoneLogic)
			{
				var dateTime = DateTime.Now;
                DeviceConfiguration.InvalidateOneDevice(device);
                DeviceConfiguration.UpdateOneDeviceCrossReferences(device);
				device.OnChanged();
			}
            zone.UpdateExternalDevices();
			var indicatorsInZone = new List<Device>(zone.IndicatorsInZone);
			foreach (var device in indicatorsInZone)
			{
                DeviceConfiguration.InvalidateOneDevice(device);
                DeviceConfiguration.UpdateOneDeviceCrossReferences(device);
				device.OnChanged();
			}
		}