The argument type 'Dialog' can't be assigned to the parameter type 'Widget Function(BuildContext)'

I am trying to display a Form Widget 2ithin a Dialog as following:

onPressed: () async {
  switch (currentScreen.toString()) {
    case 'OverviewScreen':
      () => showDialog(
          context: context,
          builder: const Dialog(child: FormBasicDetails()));
      break;
  }
},

But I get the following error at the builder line:

The argument type ‘Dialog’ can’t be assigned to the parameter type
‘Widget Function(BuildContext)’

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>Solution :

builder provides callback method with context.

It will be

showDialog(
  context: context,
  builder: (context) => const Dialog(