private void handleEvents() {
getElement().addEventListener(Event.KEYDOWN, new EventListener() {
@Override
public void handleEvent(Event evt) {
JsKeyboardEvent keyEvt = (JsKeyboardEvent) evt;
int keyCode = keyEvt.getKeyCode();
if (KeyCode.ESC == keyCode) {
if (getDelegate() != null) {
getDelegate().onEscapeKey();
}
}