title: Change the class name of a cell in handsontable
body: <p>I want to change the class name of a "td" in a handsontable. So I use jquery to do that with "addClass". In my css file, I have a specified color with this class name.</p>
  
  <p>My css :</p>
  
  <pre><code> .error
   {
       background-color : red;
       color : blue;
   } 
  </code></pre>
  
  <p>And my jquery code is :</p>
  
  <pre><code>  &lt;script type="text/javascript"&gt;
        $(document).ready(function(){
          $('#submit_button_essai').click(function(){
              var td;
  
  
              td=(hot.getCell(1,1));
  
              $(td).addClass("error");
  
  
              $.post("ajax_insert_essai.php",{arr:data_essai}, insert_essai_callback);
  
  
  
          });
  
      });
  </code></pre>
  
  <p>I don't know how I can assign the class name to only one cell !
  Somemone can help me please ?</p>