public bool UnregisterTrackableEventHandler(ITestTrackableEventHandler trackableEventHandler)
 {
     return(this.mTrackableEventHandlers.Remove(trackableEventHandler));
 }
 public void RegisterTrackableEventHandler(ITestTrackableEventHandler trackableEventHandler)
 {
     this.mTrackableEventHandlers.Add(trackableEventHandler);
     trackableEventHandler.OnTrackableStateChanged(TestTrackableBehaviour.Status.NO_POSE, this.mStatus);
 }