extending createjs container

(function() {
 
var Button = function(label) {
  this.initialize(label);
}
var p = Button.prototype = new createjs.Container();
 
Button.prototype.Container_initialize = p.initialize;
Button.prototype.initialize = function(label) {
    this.Container_initialize();
    // add custom setup logic here.
}
 
window.Button = Button;
}());