Импорт таблицы перестал работать

<Window x:Class="Test.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:xaml="clr-namespace:StockSharp.Xaml;assembly=StockSharp.Xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="5" />
            <RowDefinition Height="237*" />
        </Grid.RowDefinitions>
        
        <Grid  HorizontalAlignment="Left" Name="grid1" VerticalAlignment="Top" Margin="5,5,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="72" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
             
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
             
            <Button Content="Подключиться" Height="23" HorizontalAlignment="Left" Name="btnConnect" VerticalAlignment="Top" Width="100" Click="btnConnect_Click" Grid.Row="1" />
            <Button Content="Экспорт DDE" Height="23" HorizontalAlignment="Left" Name="btnExportDde" VerticalAlignment="Top" Width="100" Click="btnExportDde_Click" IsEnabled="False" Grid.Column="1" Grid.Row="1" />
            <TextBox Height="23" HorizontalAlignment="Left" Name="PathDir" VerticalAlignment="Top" Width="272" Grid.ColumnSpan="3"/>
            <Button Content="..." Name="FindPath" Click="FindPath_Click" HorizontalAlignment="Left" Width="28" Height="23" VerticalAlignment="Top" Grid.Column="3" />
            <Button Content="BuyAtMarket" Grid.Column="2" Grid.ColumnSpan="2" Grid.Row="1" Height="23" HorizontalAlignment="Left" Name="BuyAtMarket" VerticalAlignment="Top" Width="100" Click="BuyAtMarket_Click" IsEnabled="False" />
        </Grid>
        
        <!--Отображение сделок-->
        <xaml:TradeGrid x:Name="TradeGrid" Grid.Row="2"/>
    </Grid>
</Window>

using System.Linq;
using System.Windows;
using System.Windows.Forms;
using MessageBox = System.Windows.MessageBox;

using Ecng.Collections;
using Ecng.Common;
using Ecng.Xaml;

using StockSharp.Algo.Testing;
using StockSharp.BusinessEntities;
using StockSharp.Quik;

namespace Test
{
	public partial class MainWindow
	{
		private RealTimeEmulationTrader<QuikTrader> _quikTrader;

		private Security _security;
		private const string _securityCode = "RIH3";

		private Portfolio _portfolio;
		private const string _portfolioCode = "номер счета";

		public MainWindow()
		{
			InitializeComponent();
		}

		private void FindPath_Click(object sender, RoutedEventArgs e)
		{
			var dlg = new FolderBrowserDialog();

			if (!PathDir.Text.IsEmpty())
				dlg.SelectedPath = PathDir.Text;

			if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
			{
				PathDir.Text = dlg.SelectedPath;
			}
		}

		private bool _isConnected;

		private void btnConnect_Click(object sender, RoutedEventArgs e)
		{
			if (!_isConnected)
			{
				if (PathDir.Text.IsEmpty())
					MessageBox.Show(this, "Путь к Quik не выбран");
				else
				{
					if (_quikTrader == null)
					{
						_quikTrader = new RealTimeEmulationTrader<QuikTrader>(new QuikTrader(PathDir.Text));

						_quikTrader.UnderlyingTrader.SecuritiesTable.Columns.Add(DdeSecurityColumns.MinStepPrice);
						_quikTrader.UnderlyingTrader.SecuritiesTable.Columns.Add(DdeSecurityColumns.MaxPrice);
						_quikTrader.UnderlyingTrader.SecuritiesTable.Columns.Add(DdeSecurityColumns.MinPrice);

						_quikTrader.NewSecurities += securities =>
						{
							if (_security.IsNull())
							{
								_security = securities.FirstOrDefault(sec => sec.Code == _securityCode);
								_quikTrader.RegisterMarketDepth(_security);
							}
						};

						_quikTrader.NewPortfolios += portfolios =>
						{
							if (_portfolio.IsNull())
								_portfolio = portfolios.FirstOrDefault(p => p.Name == _portfolioCode);
						};

						// Добавление сделок в TradeGrid
						_quikTrader.NewMyTrades += trades => this.GuiAsync(() => TradeGrid.Trades.AddRange(trades));

						_isConnected = true;
						btnExportDde.IsEnabled = true;
					}

					_quikTrader.Connect();

					_isConnected = true;
					btnConnect.Content = "Отключиться";
				}
			}
			else
			{
				_quikTrader.Disconnect();

				_isConnected = false;
				btnConnect.Content = "Подключиться";
			}
		}

		private void btnExportDde_Click(object sender, RoutedEventArgs e)
		{
			if (_isDdeStarted) StopDde();
			else StartDde();
		}

		private bool _isDdeStarted;

		private void StartDde()
		{
			_quikTrader.StartExport();
			_isDdeStarted = true;
			BuyAtMarket.IsEnabled = true;
		}

		private void StopDde()
		{
			_quikTrader.StopExport();
			_isDdeStarted = false;
			BuyAtMarket.IsEnabled = false;
		}

		protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
		{
			if (_quikTrader != null)
			{
				if (_isDdeStarted) StopDde();
				_quikTrader.Disconnect();
				_quikTrader.Dispose();
			}

			base.OnClosing(e);
		}

		private void BuyAtMarket_Click(object sender, RoutedEventArgs e)
		{
			var order = new Order
			{
				Volume = 1,
				Portfolio = _portfolio,
				Security = _security,
				Direction = OrderDirections.Buy,
				Type = OrderTypes.Limit,
				Price = _security.MaxPrice,
			};

			_quikTrader.RegisterOrder(order);
		}

	}
}