Provides data for the E:Telerik.Web.UI.RadScheduler.OccurrenceDelete event of the Telerik.Web.UI.RadScheduler control.
Gets the master appointment that was used to generate the occurrence.
Gets the appointment.
Gets the occurrence appointment that is about to be removed.
This can also be the master appointment itself. If this is the case,
it'll remain in the Appointments collection, but it will be hidden (Visible=false).