createjs - CreateJS - How to know when an object is added on the stage?

Question

I'm using create js to convert flash object into javascript. I want to use a function in the object's timeline when the stage is created, but this function doesn't exist when i call it. How to know when the object is fully added on stage ?

var button = new lib.objCreateJs();
stage_createJs.addChild(button);
button.move(); // return " Uncaught TypeError: Object [object Object] has no method 'move' "

part my object :

(function (lib, img, cjs) {

var p; // shortcut to reference prototypes

// stage content:
    (lib.objCreateJs = function(mode,startPosition,loop) {
        this.initialize(mode,startPosition,loop,{})
        // timeline functions:
        this.frame_0 = function() {
            this.move = function()
            {
                this.mcBouge.gotoAndStop("move");
            }
        }

I got the answer : the stage must be updated (stage.update(); ) when an object is added.