EaselJS Custom Display Object in ES6 - v.0.0.2 - DOESN'T WORK (to delete in feb 2016)

main.js (usage)

import MyButton from './MyButton.js';
const stage = new createjs.Stage("demo");

const btn = new MyButton('red');
stage.addChild(btn);
btn.x = 100;
btn.y = 100;
stage.update();

MyButton.js

class MyButton extends createjs.Container{

  constructor(color) {
    super();
    this.radius = 40;
    this.color = color || 'grey';
  }
  
  // NOTE: draw is never invoked! :(
  draw() {
    super.draw();
    // or:
    this.Container_draw();
    const circle = new createjs.Shape();
    circle.graphics.beginFill(this.color).drawCircle(0, 0, this.radius);
  }

}
// export default MyButton;
export default createjs.promote(MyButton, "Container")