var Container = require('./Container'); 
var GameObjectFactory = require('../GameObjectFactory'); 
var hasWarned = false ; 
GameObjectFactory.register('container', function (x, y, children){ 
if (!hasWarned) { 
console.warn('Use of a beta feature: Containers'); 
hasWarned = true ; 
} 
return this.displayList.add(new Container(this.scene, x, y, children)); 
} 
);