content: import 'package:flutter/material.dart';
  
  main() => runApp(new ShowPersistentBottomSheetWidget());
  
  class ShowPersistentBottomSheetWidget extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return new MaterialApp(
        title: 'Test',
        home: new Scaffold(
            appBar:
                new AppBar(title: new Text('Flutter UI Widget -- BottomSheet')),
            body: Builder(
              builder: (context) {
                return RaisedButton(
                  onPressed: () {
                    showBottomSheet(
                        context: context,
                        builder: (context) => BottomSheet(
                            onClosing: () {},
                            builder: (context) => Container(
                                  height: 200.0,
                                  color: Colors.blue,
                                  child: Center(
                                    child: RaisedButton(
                                      onPressed: () {
                                        Navigator.of(context).pop();
                                      },
                                      child: Text('dismissBottomSheet'),
                                    ),
                                  ),
                                )));
                  },
                  child: Text('showBottomSheet'),
                );
              },
            )),
      );
    }
  }
  