@Override
  protected JComponent createCenterPanel() {
    JPanel mainPanel = new JPanel(new GridBagLayout());
    final TitledSeparator separator = new TitledSeparator();
    mainPanel.add(separator, new GridBagConstraints(0, GridBagConstraints.RELATIVE, 2, 1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL,
                                                    JBInsets.emptyInsets(), 0, 0));

    myList = createTargetVariableChooser();
    myList.addListSelectionListener(new ListSelectionListener() {
      @Override
      public void valueChanged(ListSelectionEvent e) {
        validateTextFields(e.getFirstIndex());
      }
    });

    separator.setText(RefactoringBundle.message("moveInstanceMethod.select.an.instance.parameter"));

    final JScrollPane scrollPane = ScrollPaneFactory.createScrollPane(myList);
    mainPanel.add(scrollPane, new GridBagConstraints(0, GridBagConstraints.RELATIVE, 1, 1, 1.0, 1.0, GridBagConstraints.WEST, GridBagConstraints.BOTH,
                                                     JBInsets.emptyInsets(), 0, 0));

    myVisibilityPanel = createVisibilityPanel();
    mainPanel.add(myVisibilityPanel, new GridBagConstraints(1, GridBagConstraints.RELATIVE, 1, 1, 0.0, 1.0, GridBagConstraints.WEST, GridBagConstraints.VERTICAL,
                                                            JBInsets.emptyInsets(), 0, 0));

    final JPanel parametersPanel = createParametersPanel();
    if (parametersPanel != null) {
      mainPanel.add(parametersPanel, new GridBagConstraints(0, GridBagConstraints.RELATIVE, 1, 1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL,
                                                            JBInsets.emptyInsets(), 0, 0));
    }

    separator.setLabelFor(myList);
    validateTextFields(myList.getSelectedIndex());

    updateOnChanged(myList);
    return mainPanel;
  }
@Override
  protected JComponent createCenterPanel()