As far as I understand you have Appointments
property in the ViewModel, the AppointmentsSource
of the ScheduleView is bound to it and the data is received asynchronously. If that's the case, please try to define the Appointments
property initially as an empty ObservableCollection ( in the constructor of the ViewModel) and then just add the Appointments to it.
If this does not help, I'd ask you to send us a small demo project where we could test the exact scenario. You should open a support ticket and attach it there.
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