@Override
public void onEvent(IEvent <?> event) {
super.onEvent(event);
if (event.getPayload() instanceof AjaxRequestHandler) {
final AjaxRequestHandler target = (AjaxRequestHandler) event.getPayload();
target.addListener(new IListener() {
@Override
public void onBeforeRespond(Map<String, Component> map, AjaxRequestTarget target) {
}
@Override