private void initRepositories() {
    final ListSelectionModel selectionModel = new DefaultListSelectionModel();
    selectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    myRepositoriesList.setSelectionModel(selectionModel);
    myRepositoriesList.addListSelectionListener(
      e -> myTestConnectionButton.setEnabled(myTestConnectionPerformer.enabled() && (myRepositoriesList.getSelectedValue() != null)));
  }
private void initRepositories()