anchor.diff:        return Container();
       }
     }
  -
  +  List<Widget> dateButtonList;
     List<Widget> buildDateWidgets(List<DateTime> dates) {
  -    List<Widget> dateButtonList = new List<Widget>();
  +    dateButtonList = new List<Widget>();
       dates.forEach((f) => dateButtonList.add(FlatButton(
             color: Colors.white,
             textColor: Colors.black,
  
positive.code:           disabledTextColor: Colors.black,
            padding: EdgeInsets.all(8.0),
            splashColor: Colors.blueAccent,
            onPressed: () {
              _updateData();
            },
            child: Text(
              new DateFormat("MMMd").format(f),
  
negative.code:                 scrollDirection: Axis.horizontal,
                  children: buildDateWidgets(data.dates))),
          SizedBox(
            height: 500,
            child: ListView.builder(
                itemCount: uids.length,
                itemBuilder: (BuildContext ctxt, int index) =>
  