private void checkDaylight_CheckedChanged(object sender, EventArgs e) {
			bool bEnabled = checkDaylight.Checked;
			pickerDaylightStart.Enabled = bEnabled;
			pickerDaylightEnd.Enabled = bEnabled;

			if (gridSession.SelectedDataRows.Length > 0) {
				SessionObject cSession = gridSession.SelectedDataRows[0] as SessionObject;
				DaylightTime cDaylightTime = cSession.Daylight;

				if (bEnabled) {
					if (cDaylightTime == null) {
						cDaylightTime = new DaylightTime();
						cDaylightTime.StartDate = DateTime.UtcNow;
						cDaylightTime.EndDate = DateTime.UtcNow;

						cSession.Daylight = cDaylightTime;
					}
				} else {
					if (cDaylightTime != null) {
						cSession.Daylight = null;
					}
				}
			}
		}