title: MultiSelect with formControlName
body: <p>I tried to use the PrimeNG MultiSelect with a reactive form. When I try to select one item, all the items in my MultiSelect are selected and it displays undefined.
  You can find the code in the <a href="https://plnkr.co/edit/109mbu?p=preview" rel="nofollow noreferrer"><code>Plunker</code></a></p>