public void actionPerformed(ActionEvent e) {
String datastoreName = (String) _datastoreComboBox.getSelectedItem();
if (datastoreName != null) {
_datastore = _datastoreCatalog.getDatastore(datastoreName);
_masterTermColumnComboBox.setModel(_datastore);
_masterTermColumnComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent itemEvent) {
Table table = _masterTermColumnComboBox.getSelectedItem().getTable();
_synonymColumnsPanel.updateSourceComboBoxes(_datastore, table);