void OnEnable()
        {
            window = this;

            titleContent = new GUIContent("Property");

            this.minSize = new Vector2(273f, 102f);
            loadAnimatorData();
            scrollView = new Vector2(0f, 0f);
            // define styles
        }
 void OnDisable()
 {
     window = null;
     track  = null;
 }