public AlterarPedidoPageViewModel(INavigationService navigationService) : base(navigationService)
        {
            Title = "Alterar Pedido";

            AlterarCommand = new Command(async() =>
            {
                var pedido = new Pedido()
                {
                    Id              = Id,
                    SLA             = SelectedSLAItem.Value,
                    TipoDeServicoId = SelectedItem.Key,
                    ValorMaoDeObra  = ValorMaoDeObra,
                    ValorPecas      = ValorPecas,
                    VeiculoId       = VeiculoId
                };

                try
                {
                    await PedidoService.Alterar(pedido);
                }
                catch
                {
                    await navigationService.NavigateAsync("MenuPage");
                }
            });
        }