Не могу победить первое видео

using System.Windows;

namespace _01_Connect_and_get_security
{
using System.IO;
using StockSharp.Algo;
using StockSharp.Configuration;
using StockSharp.BusinessEntities;
using Ecng.Serialization;

/// <summary>
/// Логика взаимодействия для MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private readonly Connector _connector = new Connector();
private const string _connectFile = "ConnectFile";
public MainWindow()
{
InitializeComponent();
if(File.Exists(_connectFile))
{
_connector.Load(new XmlSerializer<SettingsStorage>().Deserialize(_connectFile));
}
}

private void Setting_Click(object sender, RoutedEventArgs e)
{
if(_connector.Configure(this))
{
new XmlSerializer<SettingsStorage>().Serialize(_connector.Save(), _connectFile);
}
}

private void Connect_Click(object sender, RoutedEventArgs e)
{
SecurityPicker.SecurityProvider = _connector;
SecurityPicker.MarketDataProvider = _connector;
_connector.Connect();
}

private void SecurityPicker_SecuritySelected(Security security)
{
if (security == null) return;
_connector.RegisterSecurity(security);
}


}
}