title: angular-ui shift button keypress
body: <p>I've managed to get enter keypress to work.  But I can't seem to get the "shift" button keypress to work. Here is my code for enter:</p>
  
  <pre><code>&lt;button 
      class="btn btn-primary order-input-add" 
      ui-keypress="{13:'add_plu(order.orderwindow.add_field)'}" 
      ng-click="add_plu(order.orderwindow.add_field)"&gt;Add
  &lt;/button&gt;
  </code></pre>