easeljs - Button CreateJs -

can me. can´t make button work... used similar before. call gamemenu scene inside js.

var scene = new game.gamemenu();     scene.on(game.gamestateevents.game, this.onstateevent, this, true, {state:game.gamestates.game});     stage.addchild(scene); 

the button here inside code:

(function (window) { window.game = window.game || {} function gamemenu() {     this.initialize(); } var p = gamemenu.prototype = new createjs.container(); p.btniniciar; p.container_initialize = p.initialize;  p.initialize = function () {     this.container_initialize();     this.addtitle();     this.addbutton(); }  p.addtitle = function () {     var titulo = new createjs.sprite(spritesheet, 'titulo');     titulo.x = screen_width / 2 - titulo.getbounds().width/2;     titulo.y = screen_height / 2 - titulo.getbounds().height/2;     this.addchild(titulo); }  p.addbutton = function() {     this.btniniciar = new createjs.sprite(spritesheet, 'btniniciar');     this.btniniciar.mouseenabled = true;     this.btniniciar.cursor = 'pointer';     this.btniniciar.x = screen_width / 2 - this.btniniciar.getbounds().width/2;     this.btniniciar.y = (screen_height / 2 - this.btniniciar.getbounds().height/2) + 200;     stage.addchild(this.btniniciar);      this.btniniciar.addeventlistener("click", function(event) {         console.log("click not working");     });  }  window.game.gamemenu = gamemenu; }(window));