title: How do I highlight all invalid dijit.form.ValidationTextBoxes on a dijit.form.Form?
body: <p>what I'm after is a form that when submitted, runs a validation check, and highlights all invalid fields and adds the tooltips.</p>
  
  <p>I'm effectively looking for something like this:</p>
  
  <pre><code>dojo.forEach(dijit.byId('myForm')._invalidWidgets, function (thisWidget,index,array) {
      thisWidget.displayMessage("normal invalid/empty message should go here, seems I should be calling something higher level than this");
  });
  </code></pre>
  
  <p>but I don't want to be digging that deep, all I want to do is trigger the same sort of thing that's triggered when you tab out of an empty required field (exclamation icon and appropriate invalid/empty message). Maybe I should just try and fire the tab-out event?</p>
  
  <p>Can someone point me in the right direction?</p>