anchor.diff:              });
           }
         },
  -      information: "Information about yourself on Code Wars.\n"
  -          "You can change your username.",);
  +      information: "Refresh",);
       _allPages = <_Page>[_friends, _kata, _me];
       _tabController = new TabController(vsync: this, length: _allPages.length);
       _tabController.addListener(_handleTabSelection);
  
positive.code:   _debugDataSourceButton() =>
        new IconButton(icon: new Icon(Icons.bug_report), onPressed: () {
          setState(() {
            _performChangeUser("""
  {"username": "ice1000","name": "千里冰封","honor": 935,"clan": "Gensokyo",
  "leaderboardPosition": 4552,"skills": ["haskell","cross dress","sell moe"],
  "ranks": {"overall": {"rank": -4,"name": "4 kyu","color": "blue","score":
  1296},"languages": {
  "java": {"rank": -8,"name": "8 kyu","color": "white","score": 2 },
  "dart": {"rank": -8,"name": "8 kyu","color": "white","score": 3},
  "haskell": {"rank": -4,"name": "4 kyu","color": "blue","score": 1291}}},
    "codeChallenges": {"totalAuthored": 0,"totalCompleted": 89}}""");
          });
        });
  }
  
negative.code:       displayWhenEmpty: 'Friends', // 还有这种friend?
        tabLabel: 'Friends',
        icon: Icons.add,
        information: "Add friend",);
      _kata = new _Page(
        displayWhenEmpty: 'Kata',
        tabLabel: 'Kata',
        icon: Icons.add_box,
        information: "Add Kata",);
      _me = new _Page(
        displayWhenEmpty: 'User not set yet.',
        tabLabel: 'Me',
  