text: const animationPage = require('./animation');
  const peoplePage = require('./people');
  const trayPage = require('./tray');
  const {Button, NavigationView, Page, ui} = require('tabris');
  
  let navigationView = new NavigationView({
    left: 0, top: 0, right: 0, bottom: 0
  }).appendTo(ui.contentView);
  
  let mainPage = new Page({
    title: 'Animation Examples'
  }).appendTo(navigationView);
  
  [animationPage, peoplePage, trayPage].forEach((page) => {
    new Button({
      left: 8, top: 'prev() 8', right: 8,
      text: page.title
    }).on('select', () => page.appendTo(navigationView))
      .appendTo(mainPage);
  });
  