Material and RaisedButton.

sky/sdk/lib/framework/widgets/menu_item.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 'button_base.dart';
 import 'icon.dart';
 import 'ink_well.dart';
 import 'ui_node.dart';
 import 'wrappers.dart';
 
@@ skipping 22 matching lines @@
     icon = source.icon;
     children = source.children;
     onGestureTap = source.onGestureTap;
     super.syncFields(source);
   }
 
   UINode buildContent() {
     return new EventListenerNode(
       new Container(
         child: new InkWell(
-          children: [
+          child: new Flex([
             new Padding(
               child: new Icon(type: "${icon}_grey600", size: 24),
               padding: const EdgeDims.symmetric(horizontal: 16.0)
             ),
             new FlexExpandingChild(
               new Padding(
                 child: new Flex(children, direction: FlexDirection.horizontal),
                 padding: const EdgeDims.symmetric(horizontal: 16.0)
               ),
               flex: 1
             )
-          ]
+          ])
         ),
         height: 48.0,
         decoration: highlight ? _kHighlightDecoration : _kHighlightBoring
       ),
       onGestureTap: onGestureTap
     );
   }
 }