periodLabel = new Label(composite, SWT.NULL);
periodLabel.setText("Per�odo:");
periodLabel.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
periodLabel.setEnabled(true);
GDDate today = new GDDate();
startPeriodText = new DateText(composite, SWT.SINGLE | SWT.BORDER);
startPeriodText.setValue(today.getDate());
startPeriodText.setEnabled(true);
final Label atLabel = new Label(composite, SWT.NULL);
atLabel.setText("�");
atLabel.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
atLabel.setEnabled(true);
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) {