try {
Registration registration = (Registration) system
.query(new GetRegistration(registrationId));
if (system.getRegisterMachine() != null) {
windowControl.openRegisterMachineControlCenter();
new RegisterMachineParcelPayDialog(getParent().getShell(),
registration, parcelId).open();
} else {
windowControl.openRegistrationControlCenter(registration
.getStudent().getId(), registrationId);
new RegistrationParcelPaymentDialog(getParent().getShell(),