[Moo] Sample code of Chain in Official Doc not working?

[Chris Jiang]

Hi guys, basically, I'm trying to implement an standalone chain controller 
to my project, but the official sample code seems not working, and I can't 
find why. How should I create a set of functions to be executed one after 
each? @@"

    var Todo = new Class({
        Implements: Chain,
        initialize: function(){
            this.chain.apply(this, arguments);
        }
    });
 
    var myTodoList = new Todo(
        function(){ alert('get groceries'); },
        function(){ alert('go workout'); },
        function(){ alert('code mootools documentation until eyes close 
involuntarily'); },
        function(){ alert('sleep'); }
    );