title: Customize required attribute
body: <p>I've been trying to custumize the required attribute using <a href="https://stackoverflow.com/questions/4370228/change-default-the-0-field-is-required-ultimate-solution">this</a> solution</p>
  
  <p>But I get that I'm missing a directive with:</p>
  
  <pre><code>ErrorMessageResourceType = typeof(Resources.ValidationErrors);
  ErrorMessageResourceName = "Required";
  </code></pre>
  
  <p><code>ErrorMessageResourceType</code> and <code>ErrorMessageResourceName</code>. What else do I need to make this work?</p>