Change how events are handled in Effen

sky/framework/components/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 '../animation/scroll_behavior.dart';
 import '../fn.dart';
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'scrollable.dart';
 
@@ skipping 29 matching lines @@
     sky.ClientRect itemRect = item.getBoundingClientRect();
     assert(scrollRect.height > 0);
     assert(itemRect.height > 0);
 
     setState(() {
       _height = scrollRect.height;
       _itemHeight = itemRect.height;
     });
   }
 
-  Node build() {
+  Node buildContent() {
     var itemNumber = 0;
     var drawCount = 1;
     var transformStyle = '';
 
     if (_height > 0.0) {
       if (scrollOffset < 0.0) {
         double visibleHeight = _height + scrollOffset;
         drawCount = (visibleHeight / _itemHeight).round() + 1;
         transformStyle =
           'transform: translateY(${(-scrollOffset).toStringAsFixed(2)}px)';
@@ skipping 17 matching lines @@
       children: [
         new Container(
           style: _scrollAreaStyle,
           inlineStyle: transformStyle,
           children: buildItems(itemNumber, drawCount)
         )
       ]
     );
   }
 }