title: Kendo UI Dropdownlist Filter issue
body: <p>I'm using the latest Kendo UI version with jQuery version 1.8.</p>
  
  <p>Everything works well except filtering in Kendo dropdownlists. When the filter is enabled, the dropdown is closed immediately after opening. Please see the fiddle here:
  <a href="http://jsfiddle.net/EaNm4/389/" rel="nofollow">http://jsfiddle.net/EaNm4/389/</a></p>
  
  <p><strong>HTML</strong></p>
  
  <pre><code>&lt;input id="dropdownlist" /&gt;
  </code></pre>
  
  <p><strong>JavaScript</strong></p>
  
  <pre><code>$('#dropdownlist').kendoDropDownList({
      optionLabel: 'Select option...',
      dataTextField: 'text',
      dataValueField: 'value',
      dataSource: data,
      filter: "contains"
  });
  </code></pre>
  
  <p>When I changed the jQuery to a higher version (>= 1.9), the problem was resolved. However for some reasons I can't upgrade jQuery version at the moment.
  Does anyone know a "HACK" to fix this problem without changing jQuery version?
  Thank you.</p>