/**
  * Create the {@link Tree} of Mail options.
  *
  * @param images the {@link Images} used in the Mail options
  * @return the {@link Tree} of mail options
  */
 @ShowcaseSource
 private Tree createMailItem(Images images) {
   Tree mailPanel = new Tree(images);
   TreeItem mailPanelRoot = mailPanel.addItem("*****@*****.**");
   String[] mailFolders = constants.cwStackPanelMailFolders();
   addItem(mailPanelRoot, images.inbox(), mailFolders[0]);
   addItem(mailPanelRoot, images.drafts(), mailFolders[1]);
   addItem(mailPanelRoot, images.templates(), mailFolders[2]);
   addItem(mailPanelRoot, images.sent(), mailFolders[3]);
   addItem(mailPanelRoot, images.trash(), mailFolders[4]);
   mailPanelRoot.setState(true);
   return mailPanel;
 }