Setter for AutocompleteBox Doesn't Trigger

Question

I need to the property in the class to update as selecteditems are changed. But when I set a breakpoint for the setter, it's never actually fired. May I ask how do I get around this?

<telerik:RadAutoCompleteBox ....
                            SelectedItems"{Binding Occurence.Appointment.SelectedAttendees, Mode=TwoWay}"
                            .../>

CustomAppointment.cs

public BindableCollection<AttendeeSearchDTO> SelectedAttendees
{
    get
    {
        return selectedAttendees;
    }
    set
    {            
        if (selectedAttendees != value)
        {
            selectedAttendees = value;
            this.OnPropertyChanged(() => this.SelectedAttendees);
        }
    }
}

I can set a break point for other components such as below, and it fires completely fine.

<TextBox  Text="{Binding Occurrence.Appointment.Body, Mode=TwoWay}" />

Answer 1

Try to use ObservableCollection instead of BindableCollection

public ObservableCollection <AttendeeSearchDTO> SelectedAttendees
{
    get
    {
        return selectedAttendees;
    }
    set
    {            
        if (selectedAttendees != value)
        {
            selectedAttendees = value;
            this.OnPropertyChanged(() => this.SelectedAttendees);
        }
    }
}