title: How to scroll page in flutter
body: <p>My code for a page is like this. i need to scroll part below appbar.</p>
  
  <pre><code>@override
    Widget build(BuildContext context) {
      return new Scaffold(
        appBar: new AppBar(... ),
        body: new Stack(
          children: &lt;Widget&gt;[
            new Container(
              decoration: BoxDecoration(
                  image: DecorationImage(...),
            new Column(children: [
              new Container(...),
              new Container(...... ),
              new Padding(
                child: SizedBox(
                  child: RaisedButton(..),
              ),
              new Divider(),
              new Column(
                children: &lt;Widget&gt;[
                  new Container(
                    child: new Row(
                      children: &lt;Widget&gt;[
                        new Expanded(
                          child: new Text(  ),
                        ),
                        new IconButton(
                          icon: IconButton(..),
                          onPressed: () {
                            _changed(true, "type");
                          },
                        ),
                      ],
                    ),
                  ),
                  visibilityPropertyType
                      ? new Container(
                          margin: EdgeInsets.all(24.0),
                          child: new Column(
                            children: &lt;Widget&gt;[
                              new Row(
                                children: &lt;Widget&gt;[
                                  new Expanded(... ),
                                  new RaisedButton(..)
                                ],
                              ),
                              new Padding(
                                padding: const EdgeInsets.only(top: 10.0),
                                child: new Row(
                                  mainAxisAlignment:
                                      MainAxisAlignment.spaceEvenly,
                                  children: &lt;Widget&gt;[
                                    new Column(
                                      children: &lt;Widget&gt;[
                                        new Row(  
                                          children: &lt;Widget&gt;[.. ]),
                                        new Row(
                                          children: &lt;Widget&gt;[]),
                                        new Row(
                                          children: &lt;Widget&gt;[]),
                                        new Row(
                                          children: &lt;Widget&gt;[],
                                    ),
                                    new Column(
                                      children: &lt;Widget&gt;[
                                        new Row(
                                          children: &lt;Widget&gt;[],
                                        ),
                                      ],
                                    ),
                                  ],
                                ),
                              ),
                            ],
                          ))
                      : new Container(),
                ],
              ),
              new Divider(
                color: Colors.white,
              )
            ])
          ],
        ),
      );
    }
  </code></pre>
  
  <p>I need to make body part scrollable. How can i implement that scroll.
  If there is any custom scroll method existing. i have tried <code>Scrollable</code> and <code>SingleChildScrollView</code> but does not meet up with my needs.
  When i used <code>SinglechildScrollView</code> it occurs an error  BoxConstraints forces an infinite height. if i removed LayoutBuilder it causes A <code>RenderFlex overflowed by 22 pixels on the bottom</code> error</p>