private void createUIComponents() {
    final com.intellij.openapi.editor.event.DocumentListener adapter = new com.intellij.openapi.editor.event.DocumentListener() {
      @Override
      public void documentChanged(@NotNull com.intellij.openapi.editor.event.DocumentEvent e) {
        validateButtons();
      }
    };

    packageTextField =
      new PackageNameReferenceEditorCombo("", myProject, RECENT_KEYS, RefactoringBundle.message("choose.destination.package"));
    packageTextField.getChildComponent().getDocument().addDocumentListener(adapter);

    existingClassField = new ReferenceEditorComboWithBrowseButton(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        final TreeClassChooser chooser = TreeClassChooserFactory.getInstance(getProject())
          .createWithInnerClassesScopeChooser(RefactorJBundle.message("select.wrapper.class"), GlobalSearchScope.allScope(myProject), null, null);
        final String classText = existingClassField.getText();
        final PsiClass currentClass = JavaPsiFacade.getInstance(myProject).findClass(classText, GlobalSearchScope.allScope(myProject));
        if (currentClass != null) {
          chooser.select(currentClass);
        }
        chooser.showDialog();
        final PsiClass selectedClass = chooser.getSelected();
        if (selectedClass != null) {
          existingClassField.setText(selectedClass.getQualifiedName());
        }
      }
    }, "", myProject, true, RECENT_KEYS);
    existingClassField.getChildComponent().getDocument().addDocumentListener(adapter);

    myDestinationCb = new DestinationFolderComboBox() {
      @Override
      public String getTargetPackage() {
        return getPackageName();
      }
    };
    ((DestinationFolderComboBox)myDestinationCb).setData(myProject, sourceMethod.getContainingFile().getContainingDirectory(), packageTextField.getChildComponent());
  }
private void createUIComponents()