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    <p>I got the answer from a coworker. He's not on SO so I'm posting on his behalf and will buy him a beer the next time we are in the same city:</p> <p>Class.refactor doesn't work on Natives (Element, Array, String, etc.) because they aren't Classes nor can they be overrided to be; MooTools just adds some cool prototypes to make them more Class-like and fun and easy to work with.</p> <p>The way to extend natives is to use the implement() method; The only problem is that this.parent() and this.previous() don't exist, so you have to get a bit trickier to extend existing methods without rewriting them:</p> <hr> <pre><code>(function(){ // Keeps the window namespace clean var old_hide = Element.prototype.hide; var old_show = Element.prototype.show; Element.implement({ hide: function() { result = old_hide.run(arguments, this); // Calls old method alert("Hiding " + this.get('tag') ); return result; }, show: function(display) { result = old_show.run(arguments, this); // Calls old method alert("Showing " + this.get('tag') ); return result; } }); })(); // Closes the private function and executes it immediately </code></pre> <hr> <p>The key concepts here are:</p> <p>1 - Encapsulate the whole shebang in a private, self-executing function so the global namespace isn't polluted by our variable assignments for the original methods (e.g. old_hide and old_show);</p> <p>2 - Use the Native object's implement() method to override each function, much like you had done as the second argument to Class.refactor;</p> <p>3 - Instead of calling this.parent() or this.previous() in each method, you call the old prototypes using MooTools' run() method, which passes the arguments with a binding to the function and executes it.</p> <p>As before, make sure to gather the result of the function.run() call and return it to maintain API consistency.</p>
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