endPeriodText = new DateText(composite, SWT.SINGLE | SWT.BORDER);
endPeriodText.setValue(today.getDate());
endPeriodText.setEnabled(true);
combo.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event arg0) {
if (combo.getSelectionIndex() == 0) {
periodLabel.setEnabled(true);
startPeriodText.setEnabled(true);
atLabel.setEnabled(true);