anchor.diff:                  ),
                   new _ContactItem(
                     icon: Icons.message,
  +                  tooltip: 'Send message',
  +                  onPressed: () {
  +                    _scaffoldKey.currentState.showSnackBar(new SnackBar(
  +                      content: new Text('In this demo, this button doesn\'t do anything.')
  +                    ));
  +                  },
                     lines: <String>[
                       '(323) 555-6789',
                       'Work'
  
positive.code:                 ),
                  new _ContactItem(
                    icon: Icons.message,
                    lines: <String>[
                      '(650) 555-6789',
                      'Home'
  
negative.code:           actions: <Widget>[
              new IconButton(
                icon: Icons.create,
                tooltip: 'Edit',
                onPressed: () {
                  _scaffoldKey.currentState.showSnackBar(new SnackBar(
                    content: new Text('This is actually just a demo. Editing isn\'t supported.')
                  ));
                }
              ),
  