title: checkbox itext - how
body: <p>I made a pdf with iText and at the moment I'm showing a booleanfield as text, stating true or false. 
  Now I was thinking to change this visualisation to a checkbox. False -> unchecked / true -> checked. If it's possible of course. </p>
  
  <p>I tried to google it but I get results of using active checkboxes for itext and so on. I just need a visualisation of a boolean field in the pdf document I create</p>
  
  <p>At the moment I just use :</p>
  
  <pre><code>...
  Phrase validation = new Phrase();
          validation.add(new Chunk(" Approved =  "
                  + documentName.getApproved(), BOLD));
  ...
  
  document.add(validation);
  </code></pre>