Hi guys, After investigation appears this is caused by a framework behavior. However it has easy workaround - just use ElementName binding to the needed property of the ViewDefinition as demonstrated below: <telerik:RadScheduleView x:Name="ScheduleView"> <telerik:RadScheduleView.ViewDefinitions> <telerik:DayViewDefinition VisibleDays="{Binding DataContext.VisibleDays, ElementName=ScheduleView}" ></telerik:DayViewDefinition> </telerik:RadScheduleView.ViewDefinitions> <telerik:RadScheduleView.AppointmentsSource> <telerik:ObservableAppointmentCollection ></telerik:ObservableAppointmentCollection> </telerik:RadScheduleView.AppointmentsSource> </telerik:RadScheduleView> Regards, Kalin