internal static extern int ObservableObject_AddEventModelEvent( IntPtr pInterface, OnCallbackEventHandler callback, ref IntPtr pHandler);
internal static extern int ObservableObject_AddNotifyPropertyChanged( IntPtr pInterface, OnCallbackEventHandler callback, ref IntPtr pHandler);
internal static extern int ObservableCollection_AddNotifyCollectionChanged( IntPtr pInterface, OnCallbackEventHandler callback, ref IntPtr pHandler);
internal static extern int Command_AddCanExecuteChanged( IntPtr pInterface, OnCallbackEventHandler callback, ref IntPtr pHandler);
internal static extern int AsyncOperation_AddCompleted( IntPtr pInterface, OnCallbackEventHandler callback, ref IntPtr pHandler);