title: Wicket boolean model
body: <p>I want to create an ajaxcheckbox without wiring it to a class attribute using propertymodel. Why does the code in the example not work? The boolean value doesnt change when the user checks or unchecks the checkbox. </p>
  
  <pre><code>boolean show = false;
  AjaxCheckBox showBox = new AjaxCheckBox("showBox", new Model&lt;Boolean&gt;(show)){
      //onUpdate stuff
  };
  </code></pre>