anchor.diff:                child: const Text('CONTINUE'),
               ),
               new Container(
  -              margin: const EdgeInsets.only(left: 8.0),
  +              margin: const EdgeInsetsDirectional.only(start: 8.0),
                 child: new FlatButton(
                   onPressed: widget.onStepCancel,
                   textColor: cancelColor,
  
positive.code:             ]
            ),
            new Container(
              margin: const EdgeInsets.only(
                left: 12.0
              ),
              child: _buildHeaderText(index)
            )
          ]
  
negative.code:   Widget _buildVerticalBody(int index) {
      return new Stack(
        children: <Widget>[
          new PositionedDirectional(
            start: 24.0,
            top: 0.0,
            bottom: 0.0,
            child: new SizedBox(
  