execute method
Implementation
@override
Future<bool?> execute(
    String caller, String propertyOrFunction, List<dynamic> arguments) async {
  if (scope == null) return null;
  var function = propertyOrFunction.toLowerCase().trim();
  switch (function) {
    case "start":
      await datepicker?.show();
  }
  return super.execute(caller, propertyOrFunction, arguments);
}