@Override
        protected JComponent createNorthPanel() {
          if (!myInputVariables.hasInstanceFields()) {
            return null;
          }
          JPanel optionsPanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 5));
          createStaticOptions(optionsPanel, JavaRefactoringBundle.message("introduce.functional.variable.pass.fields.checkbox"));
          return optionsPanel;
        }
@Override
        protected JComponent createNorthPanel()