anchor.diff:    }
   );
   
  -// Create a disabled button
  -// The button is disabled because there is no
  -// onPressed method specified
  +// Create a disabled button.
  +// Buttons are disabled when onPressed isn't
  +// specified or is null.
   new FlatButton(
     child: new Text('BUTTON TITLE')
   );""";
  
positive.code:   "selected or deselected, such as adding or removing an item's star.";
  
  const String _iconCode =
  """// Member variable holding toggle value
  bool iconButtonToggle;
  
  // Toggable icon button
  new IconButton(
    icon: Icons.thumb_up,
    onPressed: () {
      setState(() => iconButtonToggle = !iconButtonToggle);
    },
    color: iconButtonToggle ? Theme.of(context).primaryColor : null
  )""";
  
  const String _actionText =
    "# Floating action buttons\n"
    "Floating action buttons are used for a promoted action. They are "
    "distinguished by a circled icon floating above the UI and have motion "
    "behaviors that include morphing, launching, and a transferring anchor "
    "point.";
  
  const String _actionCode =
  """// Floating action button in Scaffold
  new Scaffold(
    appBar: new AppBar(
      title: new Text('Demo')
  
negative.code:   }
  );
  
  // Create a disabled button.
  // Buttons are disabled when onPressed isn't
  // specified or is null.
  new RaisedButton(
    child: new Text('BUTTON TITLE')
  );""";
  
  const String _flatText =
    "# Flat buttons\n"
    "A flat button displays an ink splash on press "
    "but does not lift. Use flat buttons on toolbars, in dialogs and "
    "inline with padding";
  
  const String _flatCode =
  """// Create a flat button.
  new FlatButton(
    child: new Text('BUTTON TITLE'),
    onPressed: () {
  