protected boolean onEvent(final AjaxRequestTarget target) {
final Request r = getCalendar().getRequest();
final String eventId = r.getRequestParameters().getParameterValue("eventId").toString();
final String sourceId = r.getRequestParameters().getParameterValue("sourceId").toString();
final EventSource source = getCalendar().getEventManager().getEventSource(sourceId);
final Event event = source.getEventProvider().getEventForId(eventId);
final int dayDelta = r.getRequestParameters().getParameterValue("dayDelta").toInt();
final int minuteDelta = r.getRequestParameters().getParameterValue("minuteDelta").toInt();
return onEventResized(new ResizedEvent(source, event, dayDelta, minuteDelta), new CalendarResponse(