public void RemoveTrackingListener(ActivelyTrackingListener aListener)
{
if (this.trackingListeners.Contains(aListener))
{
this.trackingListeners.Remove(aListener);
}
}
public void AddTrackingListener(ActivelyTrackingListener aListener)
{
if (!this.trackingListeners.Contains(aListener))
{
this.trackingListeners.Add(aListener);
}
}