// Create an iterable of the objects we want to keep in view.
this._itrObjsToTrack_ = new ArrayList<Object>();
// Set up a view controller to keep the objects in view.
this._vcrViewController_ = new ViewController(this._glcWwd_);
this._vcrViewController_.setObjectsToTrack(this._itrObjsToTrack_);
// Set up a layer to render the objects we're tracking.
// Set up a SelectListener to drag the spheres.