hi here's my question :

well I want build a wp7 control,so I write it and all go well, but the problem is that I can intercept on write(see onItemsSourcePropertyChanged)but not on read I would like explain better:

public static readonly
DependencyProperty ItemsSourceProperty=
         DependencyProperty.Register(
             "ItemsSource",
             typeof(ObservableCollection<ObjWithDesc>),
             typeof(HorizontalListBox),
             new PropertyMetadata(OnItemsSourcePropertyChanged)
         );




    static void OnItemsSourcePropertyChanged(DependencyObject obj,DependencyPropertyChangedEventArgs e)
{
         ((HorizontalListBox) obj).OnItemsSourcePropertyChanged(e);
}

OnItemsSourcePropertyChanged is called when I use SetValue(dp,..) but there isn't onItemsSourcePropertyRead ? that is called when I Use GetValue()? thanks