Inheriting the DefaultTrackableEventHandler

I have a game object that scales to size after the image target is found. However, I would like to reset that size every time the image target is lost. I was trying to inherit the OnTrackableStateChanged(), OnTrackingLost(), and OnTrackingFound(). Whenever I run the program, it seems to ignore anything I write in OnTrackingFound() or OnTrackingLost(), I think it has something to do with the inheritance, but I would take any advice, thank you

public class ScaleUp : DefaultTrackableEventHandler {     private TrackableBehaviour mTrackableBehaviour;     private float max_size;     private Vector3 curr_size;

    // Use this for initialization     void Start ()     {         max_size = 0.002F;         curr_size = transform.localScale;

        mTrackableBehaviour = GetComponent<TrackableBehaviour>();         if (mTrackableBehaviour)             mTrackableBehaviour.RegisterTrackableEventHandler(this);     }

    // Update is called once per frame     void Update()     {         if (curr_size[0] <= max_size)         {             transform.localScale += new Vector3(0.00003F, 0.00003F, 0.00003F);             curr_size = transform.localScale;         }     }

    public void OnTrackableStateChanged(         TrackableBehaviour.Status previousStatus,         TrackableBehaviour.Status newStatus)     {         Debug.Log("In State Change");         if (newStatus == TrackableBehaviour.Status.DETECTED ||             newStatus == TrackableBehaviour.Status.TRACKED ||             newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)         {             Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");             OnTrackingFound();         }         else if (previousStatus == TrackableBehaviour.Status.TRACKED &&                  newStatus == TrackableBehaviour.Status.NO_POSE)         {             Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");             OnTrackingLost();         }         else         {             // For combo of previousStatus=UNKNOWN + newStatus=UNKNOWN|NOT_FOUND             // Vuforia is starting, but tracking has not been lost or found yet             // Call OnTrackingLost() to hide the augmentations             OnTrackingLost();         }     }

    private void OnTrackingFound()     {         transform.localScale = new Vector3(0F, 0F, 0F);

    }

    private void OnTrackingLost()     {

    }

}