protected JComponent createSignaturePanel() {
    final JPanel panel = new JPanel(new BorderLayout());
    panel.add(SeparatorFactory.createSeparator(RefactoringBundle.message("signature.preview.border.title"), mySignature), BorderLayout.NORTH);
    panel.add(mySignature, BorderLayout.CENTER);

    updateSignature();
    return panel;
  }
protected JComponent createSignaturePanel()