title: I can't capture enter key in select2
body: <p>I am using select2, and I need to capture the enter key, but I can't.</p>
  
  <p>I used:</p>
  
  <pre><code>$(document).on('keydown', '.select2-input', function (ev) {
  
     if (ev.which == 13) {
       alert('press enter')     
     }
  
     if (ev.which == 9) {
       ev.preventDefault();
       ev.stopImmediatePropagation();
       alert('press tab')                
   }
  });
  </code></pre>
  
  <p>I can capture all the keys but for the enter.</p>
  
  <p>Can someone help me?</p>