showDemoDialog<DialogDemoAction>(
                        context: context,
                        child: new AlertDialog(
                            content: const TextFormFieldDemo(), // from flutter gallery text_form_field_demo.dart
                            actions: <Widget>[
                              new FlatButton(
                                  child: const Text('CANCEL'),
                                  onPressed: () {
                                    Navigator.pop(
                                        context, DialogDemoAction.cancel);
                                  }),
                              new FlatButton(
                                  child: const Text('DISCARD'),
                                  onPressed: () {
                                    Navigator.pop(
                                        context, DialogDemoAction.discard);
                                  })
                            ]));
                  }),