title: Angular 2 form validation: fields inside components
body: <p>Let's say I have something like this:</p>
  
  <pre><code>&lt;form&gt;
     &lt;my-component&gt;&lt;/my-component&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>"my-component" in it's template has an "input" element.</p>
  
  <p>How can I make my "form" to be aware of that field inside the component?
  I use template-driven form approach and I would like it to stay this way.
  The input has the "name" and "ngModel" set.</p>