title: struts checkbox : deselect and submit
body: <p>In my JSP page I have:</p>
  
  <pre><code>&lt;nested:checkbox property="product.hasEmployee" /&gt;
  </code></pre>
  
  <p>This checkbox is selected by default, when I deselect it then 
  I submit the page, I find it selected !</p>
  
  <p>how can I resolve this problem?</p>