System.NullReferenceException occurred
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Designer
  StackTrace:
       at StockSharp.Designer.Panels.SchemeTypeToStringConverter.System.Windows.Data.IValueConverter.Convert(Object value, Type targetType, Object parameter, CultureInfo culture) in C:\StockSharp\StockSharpApps\Designer\Designer\Panels\SolutionExplorerPanel.xaml.cs:line 834
  InnerException: