My First TypeScript

MyFirstTypeScript.ts

/// <reference path="libs/easeljs/easeljs.d.ts" />
/// <reference path="libs/underscore/underscore.d.ts" />

class Main extends createjs.Stage
{
    constructor(canvas: HTMLCanvasElement)
    {
      super(canvas);

    	_.bindAll(this);

    	createjs.Ticker.setFPS(60);

        var circle = new createjs.Shape();
        circle.graphics.beginFill("red").drawCircle(0, 0, 40);
        circle.x = circle.y = 50;
        this.addChild(circle);

        createjs.Tween.get(circle).to({ x: 100 }, 1000);
    }

    start()
    {
    	createjs.Ticker.addEventListener("tick", this.tickListener);
    }

    stop()
    {
    	createjs.Ticker.removeEventListener("tick", this.tickListener);
    }

    private tickListener(event: Object)
    {
    	this.update();
    }

}

window.onload = () =>
{
    var el:HTMLCanvasElement = <HTMLCanvasElement>document.getElementById("content");
    var main = new Main(el);
    main.start();
};