okButton = new Button(dialog, SWT.PUSH);
okButton.setText("Ok");
okButton.addListener(SWT.MouseUp, new Listener() {
public void handleEvent(Event event) {
if (!startText.getText().equals("")) {
persistencebleCombo.add(new AddEmployeePosition(startText.getText()), startText.getText());
dialog.dispose();
} else
startText.setFocus();
}
});