[Moo] Overloading method

[remram]

Hi everybody,
I searched the web for a solution for my problem but I'm still
unsuccessful. What I would like to do, is to do overloading my methods
in my class (in my case draw). I have no idea if it is possible to do
that with MooTools (version 1.2.4).
Please have a look at my code below.
Thank you in advanced for any hint or help.

var Star = new Class({

    draw: function(){
        return 'borderd star!';
    },

    draw: function(extra){
        return 'filled star' + extra;
    }
});