title: UI-Select doesn't show selected value
body: <p>I'm trying to bind a UI-Select control to a Class[] list. Filling it up works properly, but when i select an item, the selected item will not show. Any fix for this?</p>
  
  <p>This is my ui-select :</p>
  
  <pre><code>&lt;ui-select ng-model="vm._classId" theme="bootstrap"&gt;
                                                  &lt;ui-select-match placeholder="- Select class -"&gt;{{$select.selected.text}}&lt;/ui-select-match&gt;
                                                  &lt;ui-select-choices repeat="class.ClassId as class in vm._classes"&gt;
                                                      &lt;span ng-bind-html="class.ClassName"&gt;&lt;/span&gt;
                                                  &lt;/ui-select-choices&gt;
                                              &lt;/ui-select&gt;
  </code></pre>
  
  <p>Thanks for help !</p>