title: TabView inside CustomScrollView
body: <p>Wrapping TabBarView with SliverFillRemaining (fill remaining empty space like Expanded) gives the following error output.</p>
  
  <p>flutter: A RenderPositionedBox expected a child of type RenderBox but received a child of type
  flutter: RenderSliverList.</p>
  
  <pre><code>TabController tabContoller;
      @override
    void initState() {
      tabContoller = new TabController(
        vsync: this,
        length: 3,
      );
  
  
   @override
   Widget build(BuildContext context) {
      return new Scaffold(
          floatingActionButton:floatActionBtn(...),
          bottomNavigationBar: bottomNavigationBar(...),
          appBar: apBar(),
          body: Stack(
            children: &lt;Widget&gt;[
              CustomScrollView(
                slivers: &lt;Widget&gt;[
                  SliverAppBar(
                    backgroundColor: Colors.transparent,
                    automaticallyImplyLeading: false,
                    expandedHeight: 195.0,
                    flexibleSpace: FlexibleSpaceBar(
                      background: new Stack(
                          children: &lt;Widget&gt;[
                            ...
  
                          ]),
                    ),
                  ),
                    new SliverFillRemaining(
                      child: TabBarView(
                        controller: tabContoller,
                        children: &lt;Widget&gt;[
                          Tab(...),
                          Tab(...),
                          Tab(...)
                        ],
                      ),
                    ),
                ],
              ),
            ],
  
          )
  </code></pre>