* (thru {@link #addCalendarDataListener}.
*
* <p>Note: you can invoke this method only in an event listener.
*/
protected void fireEvent(int type, Date begin, Date end, TimeZone timezone) {
final CalendarDataEvent evt = new CalendarDataEvent(this, type, begin, end, timezone);
for (Iterator it = _listeners.iterator(); it.hasNext();)
((CalendarDataListener)it.next()).onChange(evt);
}