@SuppressWarnings("unchecked")
private void loadTableData(Person person) throws Exception {
studentRegistrationTable.setEnabled(true);
studentRegistrationTable.removeAll();
registrations = (List<Registration>) system.query(new GetRegistrationByPerson(person.getId()));
updateRegistagionTable();
if (selectedRegistration == null){
parcelTable.setEnabled(false);
parcelTable.removeAll();