title: what is this ? Mootools class or object?
body: <p>I view a file and see that</p>
  
  <pre><code>var Modal = {
    presets: {....},
    initialize: function(){...},
    addClick: function(){...},
    extend: $extend
  }
  Modal.extend(Events.prototype);
  Modal.extend(Options.prototype);
  Modal.extend(Chain.prototype);
  </code></pre>
  
  <p>i think Modal is a object.</p>
  
  <p>addClick key with value is a function</p>
  
  <p>i call it like addClick function.</p>
  
  <p>in this function have a line </p>
  
  <p>this.setOptions();</p>
  
  <p>and i catch a error : this.setOptions is not a function</p>