How to injection C++/CLI base ref class to in native class.

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C++/CLI

I want to use my base ref class in native other class.

My code is like this.

This is first class in a header file:

#include "SecondNativeClass.h"
using namespace System;
namespace Vrp
{
    public ref class BaseClass
    {
    public:
        ~BaseClass()
        SecondNativeClass* mysec;
        DoSomething()
        {
         mysec = new SecondNativeClass();
        }
        .
        .
        .
    }
}

This is second class in a header file:

#include "AnotherNativeClass.h"
using namespace System;
namespace Vrp
{
    //class BaseClass;
    public class SecondNativeClass : public AnotherNativeClass
    {
    public:
        SecondNativeClass();

//        I have try this
        gcroot<BaseClass^> base;    //-> Returned errors

//        I tried that, but again errors;
        BaseClass* base;             //-> Returned errors

//        I tried that, but again errors;
        BaseClass^ base; //-> Returned errors

//        I tried that like as on MSDN page (Mix Types Safely and Correctly)
        msclr::auto_gcroot<BaseClass^> base; //-> Returned errors
        .
        .
        .
    }
}

If I write "class BaseClass;" on top of SecondNativeClass...
This time I'm getting "this BaseClass already defined" error(s).

All classes in same namespace. But compiler returned errors.

What is right defined code?
How can I fix this problem?
Regards.