private void moveDown() {
    int selected = myTable.getSelectedRow();
    if (selected >= myMigrationMap.getEntryCount() - 1) {
      return;
    }
    MigrationMapEntry entry = myMigrationMap.getEntryAt(selected);
    MigrationMapEntry nextEntry = myMigrationMap.getEntryAt(selected + 1);
    myMigrationMap.setEntryAt(nextEntry, selected);
    myMigrationMap.setEntryAt(entry, selected + 1);
    AbstractTableModel model = (AbstractTableModel)myTable.getModel();
    model.fireTableRowsUpdated(selected, selected + 1);
    myTable.setRowSelectionInterval(selected + 1, selected + 1);
  }
private void moveDown()