Listener.js

// Element Listener Mixin
(function(){
	
// Prototype.. doesn't actually work..
this.Listener = new Class(function(){
	
	var listener = new Events, removeEvent = listener.removeEvent;
	listener.removeEvent = function(key, value){
		removeEvent(key, value);
		element.removeEvent(key, value);
	};
	
	return {
		
		attach: function(key, value){
			listener.addEvent(key, value);
			this.toElement().addEvent(key, value);
		}.overloadSetter(),

		detach: function(key, value){
			if (typeof key == 'string') listener.removeEvent(key, value);
			else listener.removeEvents(key);
			return this;
		},

		toElement: function(){
			return this.element;
		}
	};
	
});


}).call(this);

// Implementation
var MyClass = new Class({
	
	Implements: [Listener, Class.Binds],
	
	initialize: function(){
		this.element = new Element('div');
		
		this.attach({
			click: this.bound('onClick'),
			'keyup:relay(:input)': this.bound('onKeyUp')
		});
	}
	
});

// Use
var myInstance = new MyClass();
myInstance.detach();