Thank you for your answer.
What I'm trying to achieve is to have a custom confirmation dialog for deleting recurring appointments.
The default dialog consists of two choices; either to delete the selected occurrence, or the entire series.
I want to add two more choices. Namely:
- Delete every occurrence from the first one to the selected one (by setting the 'RecurrsUntil' property)
- Delete every occurrence from the selected one to the last one (by changing the starting date)
My attempt was to create a custom dialog with a custom ViewModel (inheriting from RecurrenceChoiceDialogViewModel), but I didn't want to interefere with the logic, when the user wanted to edit, drag or resize the appointment.