Anyone has any idea why DebuggerTypeProxyAttribute doesn't seem to work when made in c++/cli?

Question

Has anyone ever tried creating a class which implements the DebuggerTypeProxy attribute? I have done it successfully in c#, but even when creating simple classes in c++/cli, it doesn't seem to work. I am aware c++'s IDE doesn't recognize it, but I am compiling everything in c++/cli and then running it on c#.

#pragma once

using namespace System;
using namespace System::Diagnostics;

namespace DebuggerTypeProxytests {
    ref class Class1;
    ref class Class2;

    [DebuggerTypeProxy(Class2::typeid)]
    public ref class Class1
    {
    public:
     String^ abc;

     ref class Class2 {
     public:
      Class2(Class1 cls) {
      }

      property String^ Value { String^ get() { return "works!"; } }
     };
    };
}