xaml嵌套类路径设计器问题

public class Enums
{
  public enum WindowModeEnum { Edit, New }
}

<Style.Triggers>
    <DataTrigger Binding="{Binding WindowMode}"
        Value="{x:Static Types1:Enums+WindowModeEnum.Edit}">
             <Setter Property="Visibility"
                     Value="Collapsed" />
    </DataTrigger>
</Style.Triggers>

代码编译和运行正常,但我无法在设计窗口中打开xaml代码。我收到以下错误:

Type 'Types1:Enums+WindowModeEnum' was not found.
   at MS.Internal.Metadata.ExposedTypes.ValueSerializers.StaticMemberDocumentValueSerializer.ConvertToDocumentValue(ITypeMetadata type, String value, IServiceProvider documentServices)
   at MS.Internal.Design.DocumentModel.DocumentTrees.Markup.XamlMarkupExtensionPropertyBase.get_Value()
   at MS.Internal.Design.DocumentModel.DocumentTrees.DocumentPropertyWrapper.get_Value()
   at MS.Internal.Design.DocumentModel.DocumentTrees.InMemory.InMemoryDocumentProperty..ctor(DocumentProperty property, InMemoryDocumentItem item)
   at MS.Internal.Design.DocumentModel.DocumentTrees.InMemory.InMemoryDocumentItem.SetUpItem(DocumentItem item)

有没有人有任何想法,如何处理它,这样我就可以打开设计模式的窗口。

弗拉德。