Material and RaisedButton.

sky/sdk/lib/framework/widgets/fixed_height_scrollable.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' as math;
 
 import 'package:vector_math/vector_math.dart';
 
 import '../animation/scroll_behavior.dart';
 import 'scrollable.dart';
@@ skipping 52 matching lines @@
         double drawStart = scrollOffset + alignmentDelta;
         itemShowIndex = math.max(0, (drawStart / itemHeight).floor());
 
         transform.translate(0.0, alignmentDelta);
       }
     }
 
     return new SizeObserver(
       callback: _handleSizeChanged,
       child: new ClipRect(
-        child: new DecoratedBox(
-          decoration: const BoxDecoration(
-            backgroundColor: const Color(0xFFFFFFFF)
-          ),
-          child: new Transform(
-            transform: transform,
-            child: new Block(buildItems(itemShowIndex, itemShowCount))
-          )
+        child: new Transform(
+          transform: transform,
+          child: new Block(buildItems(itemShowIndex, itemShowCount))
         )
       )
     );
   }
 
   List<UINode> buildItems(int start, int count);  
 
 }