Не получается получить BestAsk и BestBid цены

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Net;
using System.Security;

using MoreLinq;

using Ecng.Common;
using Ecng.Collections;
using Ecng.ComponentModel;
using Ecng.Serialization;
using Ecng.Xaml;

using StockSharp.Quik;
using StockSharp.Algo;
using StockSharp.BusinessEntities;
using StockSharp.Fix;
using StockSharp.Logging;
using StockSharp.Messages;
using StockSharp.Quik.Lua;


namespace Robot
{    
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        
        private static Security _sber;
        private static Security _vtbr;                
        private QuikTrader CommonRobot1;
        
        private void Connect_Click(object sender, RoutedEventArgs e)
        {
            CommonRobot1 = new QuikTrader
            {
                LuaFixServerAddress = "127.0.0.1:5001".To<EndPoint>(),
                LuaLogin = "quik",
                LuaPassword = "quik".To<SecureString>()
            };            

            CommonRobot1.NewPortfolios += portfolios => this.GuiAsync(() =>
                {
                    portf.ItemsSource = CommonRobot1.Portfolios;                    
                });
            
            CommonRobot1.NewSecurities += securities => this.GuiAsync(() =>
            {                
                _sber = securities.FirstOrDefault(s => s.Id == "SBER@TQBR");
                _vtbr = securities.FirstOrDefault(s => s.Id == "VTBR@TQBR");                
                financial.Items.Add(_sber);
                financial.Items.Add(_vtbr);                
            });

            CommonRobot1.Connected += () =>
            {
                CommonRobot1.StartExport();
            };

            CommonRobot1.Connect();
        }

        private void Buy_Click(object sender, RoutedEventArgs e)
        {
            int vol;

            if (String.IsNullOrEmpty(volume.Text))
                vol = 1;
            else
                vol = int.Parse(volume.Text);

            var order = new Order
            {
                Portfolio = (Portfolio)portf.SelectedItem,
                Security = _vtbr, //(Security)financial.SelectedItem,
                Volume = vol,
                Price = _vtbr.BestBid.Price,
                //Type = OrderTypes.Market,
                Direction = Sides.Buy,
            };

            CommonRobot1.RegisterOrder(order);
        }

        private void Sell_Click(object sender, RoutedEventArgs e)
        {
            int vol;

            if (String.IsNullOrEmpty(volume.Text))
                vol = 1;
            else
                vol = int.Parse(volume.Text);

            var order = new Order
            {
                Portfolio = (Portfolio)portf.SelectedItem,
                Security = (Security)financial.SelectedItem,
                Volume = vol,
                Type = OrderTypes.Market,
                Direction = Sides.Sell,
            };

            CommonRobot1.RegisterOrder(order);
        }        
    }
}