Style guide says enum values should be lowerCamelCase.

sky/sdk/lib/framework/components2/drawer_header.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 '../fn2.dart';
 import '../theme/colors.dart';
 import '../theme/view_configuration.dart';
 
 class DrawerHeader extends Component {
   static final Style _style = new Style('''
     height: ${140 + kStatusBarHeight}px;
     background-color: ${BlueGrey[50]};
     border-bottom: 1px solid #D1D9E1;
     padding-bottom: 7px;
     margin-bottom: 8px;'''
   );
 
   static final FlexBoxParentData _spacerParentData = new FlexBoxParentData()..flex = 1;
 
   static final Style _labelStyle = new Style('''
     padding: 0 16px;'''
   );
 
   List<UINode> children;
 
   DrawerHeader({ Object key, this.children }) : super(key: key);
 
   UINode build() {
     return new FlexContainer(
-      direction: FlexDirection.Column,
+      direction: FlexDirection.vertical,
       style: _style,
       children: [
         new ParentDataNode(
           new Container(key: 'Spacer'),
           _spacerParentData
         ),
         new Container(
           key: 'Label',
           style: _labelStyle,
           children: children
         )
       ]
     );
   }
 }