title: Wicket DropDownChoice Integer
body: <p>I have problem with Wicket DropDownChoice. The DropDownChoice does not show values for Integer.
  wicket version: 1.5.7</p>
  
  <pre><code>DropDownChoice&lt;Integer&gt; rEvalFormVersion = new DropDownChoice&lt;Integer&gt;("evalForm.version", EVAL_FORM_VERSIONS);
  </code></pre>
  
  <p>where EVAL_FORM_VERSIONS is list of versions.</p>
  
  <p>For example: In the list are two versions, DropDownChoice is populated by two choices but nothing is shown.
  Btw: Another data types work good.</p>
  
  <p>In the near future we will update Wicket to a new version. Is this problem in Wicket 6 or can I simply just wait for new version?</p>