title: Submit Form without transferring to the target(Vaadin)
body: <p>I'm using an FormSender addon of Vaadin to send some data to my servlet via POST works like that:</p>
  
  <pre><code>FormSender formSender = new FormSender();
      formSender.setFormMethod(FormSender.Method.POST);
      formSender.setFormTarget("Servlet URL");
  
  If(event.getSource() == Submit){
              formSender.addValue("UserName", (String) UserName.getValue());
              formSender.addValue("Password", (String) Password.getValue());
              formSender.addValue("DataBase", (String) DatabaseName.getValue());
  
  if(!UserName.getValue().equals("")&amp;&amp; !Password.getValue().equals("")&amp;&amp; !DatabaseName.getValue().equals("")){
                  formSender.submit();
  }
      }
  </code></pre>
  
  <p>now if I click on Submit button I get transferred away from my current page to the target ("Servlet URL"). is there a way to just notify the user when he clicks the button that the i've got the values without transferring him from the current page?</p>
  
  <p>Info:
  I'm working with eclipse(Helios) on a Liferay(6.0) Portal with the Vaadin(6.6.6) plugin in a Vaadin portlet </p>