private void createUIComponents() {
    myMainPanel = new JPanel();

    myWithBrowseButtonReference = createPackageChooser();
    myClassPackageChooser = createPackageChooser();

    myInnerClassChooser =
        new ClassNameReferenceEditor(
            PsiManager.getInstance(myProject), null, ProjectScope.getProjectScope(myProject));
    myInnerClassChooser.addDocumentListener(
        new DocumentAdapter() {
          public void documentChanged(DocumentEvent e) {
            validateButtons();
          }
        });

    // override CardLayout sizing behavior
    myCardPanel =
        new JPanel() {
          public Dimension getMinimumSize() {
            return myHavePackages
                ? myMovePackagePanel.getMinimumSize()
                : myMoveClassPanel.getMinimumSize();
          }

          public Dimension getPreferredSize() {
            return myHavePackages
                ? myMovePackagePanel.getPreferredSize()
                : myMoveClassPanel.getPreferredSize();
          }
        };

    myDestinationFolderCB =
        new DestinationFolderComboBox() {
          @Override
          public String getTargetPackage() {
            return MoveClassesOrPackagesDialog.this.getTargetPackage();
          }
        };
  }