C++ managed code question

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C++

C#

managed

CLR

hi guys.

i have a CLR project and a c++ managed class.
i need to mimic the behavior of the "is" keyword from c# but i dont know how to do it in managed code.

part of my code:
1.C# code:

public class emailMsg : Msg
{
    string email;
}

2.C++ manged code

Msg^ msg = gcnew Msg();
if (msg is emailMsg)
{
    //DO SOMETHING
}

the above if sentence is not compiling since managed code dont recognize the "is" keyword.
how can i solve it?