@Override
public int open() {
	if (rn != null) {
		if (Rechnung.isStorno(rn) || Rechnung.hasStornoBeforeDate(rn, new TimeTool())) {
			SWTHelper.alert(Messages.RnActions_stornoAction,
				Messages.RnActions_stornoActionNotPossibleText);
			return TitleAreaDialog.CANCEL;
		}
	}
	return super.open();
}
 

protected TitleAreaDialog getDialog( )
{
	return dialog;
}