anchor.diff:            ],
             flexibleSpace: new FlexibleSpaceBar(
               title : new Text('Ali Connors'),
  -            background: new AssetImage(
  -              name: 'packages/flutter_gallery_assets/ali_connors.png',
  -              fit: ImageFit.cover,
  -              height: _appBarHeight
  +            background: new Stack(
  +              children: <Widget>[
  +                new AssetImage(
  +                  name: 'packages/flutter_gallery_assets/ali_connors.png',
  +                  fit: ImageFit.cover,
  +                  height: _appBarHeight
  +                ),
  +                // This gradient ensures that the toolbar icons are distinct
  +                // against the background image.
  +                new DecoratedBox(
  +                  decoration: new BoxDecoration(
  +                    gradient: new LinearGradient(
  +                      begin: const FractionalOffset(0.5, 0.0),
  +                      end: const FractionalOffset(0.5, 0.30),
  +                      colors: <Color>[const Color(0x60000000), const Color(0x00000000)]
  +                    )
  +                  )
  +                )
  +              ]
               )
             )
           ),
  
positive.code:                     '(323) 555-6789',
                      'Work'
                    ]
                  )
                ]
              ),
              new _ContactCategory(
  
negative.code:                   ]
                  )
                ]
              ),
              new _ContactCategory(
                icon: Icons.today,
                children: <Widget>[
                  new _ContactItem(
                    lines: <String>[
                      'Birthday',
                      'January 9th, 1989'
                    ]
                  ),
                  new _ContactItem(
                    lines: <String>[
                      'Wedding anniversary',
                      'June 21st, 2014'
                    ]
                  ),
                  new _ContactItem(
                    lines: <String>[
                      'First day in office',
                      'January 20th, 2015'
                    ]
                  ),
                  new _ContactItem(
                    lines: <String>[
                      'Last day in office',
                      'August 9th, 2015'
                    ]
                  )
                ]
              )
            ]
          )
  