UltraTimeLine does not hiding UnassignedOwner and not showing the added owner. This happens in case owner collection store only one additional owner.
Please test the following code:
ultraCalendarInfo1.Owners.Add(
"Person1", "Person1");
ultraCalendarInfo1.Owners.UnassignedOwner.Visible =
false;
This will produce UltraTimeLine with no owner - try to create new appointment.
Thanks.
That is a bug; thanks for bringing it to our attention. It has been fixed and will be available in a future service release; you can contact Developer Support and log an incident if you want to receive a notification when the fix becomes available.