HighDefinitionFaceFrameSource.TrackingIdLost Event

public:
event TypedEventHandler<HighDefinitionFaceFrameSource^ , TrackingIdLostEventArgs^ >^ TrackingIdLost {
         EventRegistrationToken add (TypedEventHandler<HighDefinitionFaceFrameSource^ , TrackingIdLostEventArgs^ >^ value);
         void remove (EventRegistrationToken token);
}