title: select2 search not working
body: <p>I have been working the select2 plugin for a while now and until now its been perfect.</p>
  
  <p>I have a page with 3 selects that are loading data and working well, and multiple selects that are inside the popup. They are looking good but you can't write on the search field. in the main page the search is working well so i can't figure out what is the problem..</p>
  
  <p>I'm workign with the blockUI plugin for the popup. I have tried z-index, destroy and starting the plugin on a callback for the blockUI function but nothing is working and I have no idea why.</p>
  
  <p>the code:</p>
  
  <pre><code>&lt;!doctype html&gt;
  &lt;html&gt;
  &lt;head&gt;
  &lt;title&gt;ff&lt;/title&gt;
  &lt;link type="text/css" rel="stylesheet" href="http://cdn.jsdelivr.net/select2/3.2/select2.css" /&gt;
  &lt;script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="http://cdn.jsdelivr.net/select2/3.2/select2.js"&gt;    &lt;/script&gt;
  &lt;script type="text/javascript" src="http://xiao3meng.googlecode.com/files/jquery.blockUI.js"&gt;&lt;/script&gt;
  &lt;script&gt;
      $(document).ready(function() {
          $(".startselect").select2();
  
          $('#clickstartpopup').click(function() { 
              $.blockUI({ 
                  message: $('#popblock'),
                  onBlock: function() { 
                      $(".popupselect").select2();
  
                  }
              });
          });
  
      });
  &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div id="maincontent1" class="maincontent mywebsitepage"&gt;
    &lt;select  class="startselect" id="merchantList"&gt;
   &lt;option value="volvo"&gt;Volvo&lt;/option&gt;
   &lt;option value="saab"&gt;Saab&lt;/option&gt;
   &lt;option value="mercedes"&gt;Mercedes&lt;/option&gt;
   &lt;option value="audi"&gt;Audi&lt;/option&gt;
  &lt;/select&gt;
  &lt;/div&gt;
  &lt;div style="clear: both; height: 15px;"&gt;&lt;/div&gt;
  &lt;span id="clickstartpopup" style="cursor: pointer;color:red;" &gt;click me!&lt;/span&gt;
  &lt;div style="height: 300px;background-color: red;display:none;" id="popblock" &gt;
  &lt;select class="popupselect"&gt;
   &lt;option value="volvo"&gt;Volvo&lt;/option&gt;
   &lt;option value="saab"&gt;Saab&lt;/option&gt;
   &lt;option value="mercedes"&gt;Mercedes&lt;/option&gt;
   &lt;option value="audi"&gt;Audi&lt;/option&gt;
  &lt;/select&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p><br/>
  any suggestion?</p>