code: private void paintAjax(final WButton button, final XmlStringBuilder xml) {
  		// Start tag
  		xml.appendTagOpen("ui:ajaxtrigger");
  		xml.appendAttribute("triggerId", button.getId());
  		xml.appendClose();
  
  		// Target
  		xml.appendTagOpen("ui:ajaxtargetid");
  		xml.appendAttribute("targetId", button.getAjaxTarget().getId());
  		xml.appendEnd();
  
  		// End tag
  		xml.appendEndTag("ui:ajaxtrigger");
  	}
docs: Paints the AJAX information for the given WButton.
  
  @param button the WButton to paint.
  @param xml the XmlStringBuilder to paint to.