title: Calling methods on objects of type id
body: <p>when I'm trying to call a method on an object of type id, i get a warning raised (method not found). Of course not, but isn't that the sense of an id object?  </p>
  
  <p>Is there a way to <strong>tell the compiler:<br>
  "You don't now the class of the object on which i am calling this method, but don't worry, i'm sure it does implement it!"</strong> ?</p>