title: angular-validator and ui-select
body: <p>I´m newbie in angular. I´m using <code>angular-validator</code> to validate the inputs in my application. I´m using <code>ui-select</code> plugin to display select list. 
  I need is to validate if the user submitted a form &amp; he didn't chosen an option in the select list then I'm gonna show required error message like the first input does in Plunkr. I believe that the validation is right but it doesn't show any error message, I've searched in the web but still no luck in R&amp;D.</p>
  
  <p>Any help would appreciated, Thanks in advance (Apologize for my Bad English)</p>
  
  <p><a href="http://plnkr.co/edit/TbDVS2AmJTk8akvAY0C3?p=preview" rel="nofollow"><strong>Problem Plunkr</strong></a></p>