gistfile1.js

// a simple custom wrapper
var Widget = new Class(Element, {
  initialize: function(raw_element) {
    // calling the Element's constructor
    this.$super(raw_element, {
      'class': 'my-widget'
    });
  },

  // some other custom methods
});


var widget = new Widget(document.getElementById('my-element'));

// basically any time you create an instance of an `Element` class
// or it's subclass, RightJS will register the last instance as
// the default wrapper, so even if an element was already wrapped
// it will be rewrapped again, say like that

$('my-element'); // -> Element

new Widget($('my-element')._);
$('my-element'); // -> Widget