[Moo] xhr1.request is not a function

[remram]

Hi everybody,
I was just trying to execute this example from Mootools docs:
http://mootools.net/docs/more/Utilities/Group

var xhr1 = new Request({url: 'data.js', evalScripts: true});
var xhr2 = new Request({url: 'abstraction.js', evalScripts: true});
var xhr3 = new Request({url: 'template.js', evalScripts: true});

var group = new Group(xhr1, xhr2, xhr3);
group.addEvent('complete', function(){
    alert('All Scripts loaded');
});

xhr1.request();
xhr2.request();
xhr3.request();

It shows me on firebug an error: xhr1.request is not a function
I'm using mootools-core version 1.3.2 and mootools-more version
1.3.2.1.
Thank you in advance for any help or hint.
Ramy