createDerivedButton.setTooltiptext(_("Create derived"));
createDerivedButton.setSclass("icono");
createDerivedButton.setImage("/common/img/ico_derived1.png");
createDerivedButton.setHoverImage("/common/img/ico_derived.png");
createDerivedButton.addEventListener(Events.ON_CLICK,
new EventListener() {
@Override
public void onEvent(Event event) {
goToCreateDerivedForm(baseCalendar);