constructor() {
    super();

    // set initial state
    this.state = {
      showSceneItems : false,
    }

    // bind `this` to functions
    this._getInfoControls = this._getInfoControls.bind(this);
    this._onBackClick = this._onBackClick.bind(this);
    this._onBackgroundPhotoLoadEnd = this._onBackgroundPhotoLoadEnd.bind(this);
  }
Grab our created custom controls used within this scene.