/** Creates the error area component. */
 private void initErrorArea() {
   SimpleAttributeSet attribs = new SimpleAttributeSet();
   StyleConstants.setAlignment(attribs, StyleConstants.ALIGN_RIGHT);
   StyleConstants.setFontFamily(attribs, errorPane.getFont().getFamily());
   StyleConstants.setForeground(attribs, Color.RED);
   errorPane.setParagraphAttributes(attribs, true);
   errorPane.setPreferredSize(new Dimension(100, 50));
   errorPane.setMinimumSize(new Dimension(100, 50));
   errorPane.setOpaque(false);
 }
  public HelpUI(Frame parent, String title) {
    sidebar = new Sidebar();
    sidebar.setBorder(new EmptyBorder(10, 10, 10, 10));
    infoView = new JTextPane();
    Dimension d1 = sidebar.getPreferredSize();
    infoView.setPreferredSize(new Dimension(d1.width * 3, d1.height - 5));
    infoView.setEditable(false);

    MouseAdapter ma =
        new MouseAdapter() {
          @Override
          public void mouseClicked(MouseEvent me) {
            SidebarOption sopt = (SidebarOption) me.getComponent();
            if (sel != null) {
              sel.setSelected(false);
              sel.repaint();
            }
            sel = sopt;
            sel.setSelected(true);
            sel.repaint();
            renderInfo();
          }
        };

    general = new SidebarOption("General Info", HELP_GENERAL_LOC);
    general.addMouseListener(ma);
    sidebar.add(general);

    sidebar.add(Box.createVerticalStrut(scy(10)));

    artifact = new SidebarOption("Artifacts", HELP_ARTIFACTS_LOC);
    artifact.addMouseListener(ma);
    sidebar.add(artifact);

    sidebar.add(Box.createVerticalStrut(scy(10)));

    net = new SidebarOption("Networking", HELP_NET_LOC);
    net.addMouseListener(ma);
    sidebar.add(net);

    sidebar.add(Box.createVerticalStrut(scy(10)));

    gpl = new SidebarOption("License", HELP_GPL_LOC);
    gpl.addMouseListener(ma);
    sidebar.add(gpl);

    general.setSelected(true);
    sel = general;

    sidebar.add(Box.createVerticalGlue());

    add(BorderLayout.WEST, sidebar);
    add(BorderLayout.CENTER, new JScrollPane(infoView));
    setResizable(false);
    pack();
    setLocationRelativeTo(parent);
    setTitle(title);

    renderInfo();
  }