Конвертер - тип Стакан - Свойство - ошибка

Доброго времени суток. Дизайнер в4.3.17.0 При типе конвертера Стакана при выборе Свойств выпадает ошибка.

Фрагмент: Название Время Тип Сообщение S#.Designer 13.11.2016 0:49:04 Error "System.Reflection.TargetInvocationException: Адресат вызова создал исключение. ---> System.Exception: Duplicated primary key. в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.GetNodeDictionaryFromListSource() в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.LoadDataCore() в DevExpress.Xpf.Grid.TreeList.TreeListSelfReferenceDataHelper.LoadData() в DevExpress.Xpf.Grid.TreeList.TreeListDataProvider.DoRefresh(Boolean keepNodesState) в DevExpress.Xpf.Grid.TreeList.TreeListDataProvider.OnDataSourceChanged() в DevExpress.Xpf.Data.DataProviderBase.set_DataSource(Object value) в DevExpress.Xpf.Grid.DataControlBase.SetDataSource() в DevExpress.Xpf.Grid.DataControlBase.<OnItemsSourceChanged>b__60() в DevExpress.Xpf.Core.Locker.DoLockedAction(Action action) в DevExpress.Xpf.Core.Native.LockedPostponedAction.PerformLockedAction(Action primaryAction) в DevExpress.Xpf.Grid.DataControlBase.<OnItemsSourceChanged>b__5f() в DevExpress.Xpf.Core.Locker.DoLockedAction(Action action) в DevExpress.Xpf.Grid.DataControlBase.OnItemsSourceChanged(Object oldValue, Object newValue) в DevExpress.Xpf.Grid.GridControl.OnItemsSourceChanged(Object oldValue, Object newValue) в DevExpress.Xpf.Grid.DataControlBase.OnDataSourceChanged(DependencyObject dObject, DependencyPropertyChangedEventArgs e) в System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) в System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) в DevExpress.Xpf.Grid.DataControlBase.OnPropertyChanged(DependencyPropertyChangedEventArgs e) в System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) в System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)