title: Angular 2 (keydown.enter) can not preventDefault()
body: <p>the <code>event.preventDefault()</code> doesn't work when I use <code>(keydown.enter)</code> in template. <br>
  This is demo: <a href="https://plnkr.co/edit/GZrVt7l6BEO2uHfWFoTQ?p=preview" rel="noreferrer">https://plnkr.co/edit/GZrVt7l6BEO2uHfWFoTQ?p=preview</a>
  Please help me.</p>