public virtual void Stop()
 {
     if (!_isPlaying)
     {
         return;
     }
     _isPlaying = false;
     SPTween.RemoveReference(this);
     if (this.OnStopped != null)
     {
         this.OnStopped(this, System.EventArgs.Empty);
     }
 }
 public virtual void Kill()
 {
     SPTween.RemoveReference(this);
     this.SetKilled();
 }