private void initializeTargetClassEditor() {

    myTargetClassEditor =
      new ReferenceEditorComboWithBrowseButton(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
          TreeClassChooser chooser = TreeClassChooserFactory.getInstance(myContext.getProject())
            .createWithInnerClassesScopeChooser(RefactoringBundle.message("choose.destination.class"),
                                                GlobalSearchScope.projectScope(myContext.getProject()), new ClassFilter() {
                @Override
                public boolean isAccepted(PsiClass aClass) {
                  return aClass.getParent() instanceof GroovyFile || aClass.hasModifierProperty(PsiModifier.STATIC);
                }
              }, null);
          if (myTargetClass != null) {
            chooser.selectDirectory(myTargetClass.getContainingFile().getContainingDirectory());
          }
          chooser.showDialog();
          PsiClass aClass = chooser.getSelected();
          if (aClass != null) {
            myTargetClassEditor.setText(aClass.getQualifiedName());
          }

        }
      }, "", myContext.getProject(), true, RECENTS_KEY);
    myTargetClassPanel.setLayout(new BorderLayout());
    myTargetClassPanel.add(myTargetClassLabel, BorderLayout.NORTH);
    myTargetClassPanel.add(myTargetClassEditor, BorderLayout.CENTER);
    Set<String> possibleClassNames = new LinkedHashSet<>();
    for (final PsiElement occurrence : myContext.getOccurrences()) {
      final PsiClass parentClass = getParentClass(occurrence);
      if (parentClass != null && parentClass.getQualifiedName() != null) {
        possibleClassNames.add(parentClass.getQualifiedName());
      }
    }

    for (String possibleClassName : possibleClassNames) {
      myTargetClassEditor.prependItem(possibleClassName);
    }

    if (myDefaultTargetClass != null) {
      myTargetClassEditor.prependItem(myDefaultTargetClass.getQualifiedName());
    }

    myTargetClassEditor.getChildComponent().addDocumentListener(new DocumentListener() {
      @Override
      public void documentChanged(@NotNull DocumentEvent e) {
        targetClassChanged();
        updateOkStatus();
       // enableEnumDependant(introduceEnumConstant());
      }
    });
  }
private void initializeTargetClassEditor()