old_contents: require('Common');
  var win = new Window();
  application.exitAfterWindowsClose = true;
  win.visible = true;
  win.title = "Hi Tint World!";
  
  
  var webview = new WebView(); // Create a new webview for HTML.
  win.appendChild(webview); // attach the webview to the window.
  
  // position the webview 0 pixels from all the window's edges.
  webview.left=webview.right=webview.top=webview.bottom=0;
  
  // What we should do when the web-page loads.
  webview.addEventListener('load', function() {
      webview.postMessage(JSON.stringify(process.versions));
  });
  
  webview.location = "app://src/index.html"; // Tell the webview to render the index.html
new_contents: require('Common');
  var win = new Window();
  var toolbar = new Toolbar();
  
  
  application.exitAfterWindowsClose = true;
  win.visible = true;
  win.title = "Hi Tint World!";
  
  btn = new Button();
  btn.image = 'back';
  toolbar.appendChild( btn );
  win.toolbar = toolbar;
  
  
  var webview = new WebView(); // Create a new webview for HTML.
  win.appendChild(webview); // attach the webview to the window.
  
  // position the webview 0 pixels from all the window's edges.
  webview.left=webview.right=webview.top=webview.bottom=0;
  
  // What we should do when the web-page loads.
  webview.addEventListener('load', function() {
      webview.postMessage(JSON.stringify(process.versions));
  });
  
  webview.location = "app://src/index.html"; // Tell the webview to render the index.html
subject: Add toolbar with back button