Style guide says enum values should be lowerCamelCase.

sky/examples/stocks2/lib/stock_arrow.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:math';
 import 'package:sky/framework/fn2.dart';
 
 class StockArrow extends Component {
   static final Style _style = new Style('''
     width: 40px;
@@ skipping 61 matching lines @@
     return _kRedColors[_colorIndexForPercentChange(percentChange)];
   }
 
   UINode build() {
     String border = _colorForPercentChange(percentChange).toString();
     bool up = percentChange > 0;
     String type = up ? 'bottom' : 'top';
 
     return new FlexContainer(
       inlineStyle: 'border-color: $border',
-      direction: FlexDirection.Row,
+      direction: FlexDirection.horizontal,
       style: _style,
       children: [
         new Container(
           inlineStyle: 'border-$type-color: $border',
           style: up ? _upStyle : _downStyle
         )
       ]
     );
   }
 }