private void handleEvent(Object eventSource){
if(eventSource == number_month){
partial = TimePeriod.setPartialField(partial, number_month.getInteger(), TimePeriod.MONTH_TYPE);
+
}else if(eventSource == number_day){
partial = TimePeriod.setPartialField(partial, number_day.getInteger(), TimePeriod.DAY_TYPE);
+
}else if(eventSource == number_year){
partial = TimePeriod.setPartialField(partial, number_year.getInteger(), TimePeriod.YEAR_TYPE);
}