private void RbNuevaReserva_Checked(object sender, RoutedEventArgs e)
        {
            lbIdReserva.Content     = "Numero Mesa:";
            txtIdReserva.Visibility = Visibility.Visible;


            lbRutCliente.Visibility = Visibility.Visible;
            txtrut.Visibility       = Visibility.Visible;
            lbFecha.Visibility      = Visibility.Visible;
            lbHora.Visibility       = Visibility.Visible;
            cbHora.Visibility       = Visibility.Visible;
            cbMinuto.Visibility     = Visibility.Visible;
            dtpFecha.Visibility     = Visibility.Visible;
            dtpFecha.IsEnabled      = false;
            cbHora.IsEnabled        = false;
            cbMinuto.IsEnabled      = false;

            dtpFecha.IsEnabled = true;
            btnAgregar.Content = "Agregar Reserva";


            MesaBLL mesBLL = new MesaBLL();

            dtgReservas.ItemsSource = mesBLL.GetlAllMesas().DefaultView;
        }