Mixing legacy MFC code with Windows Forms (Part 2)

I know how to call unmanaged code from a managed class.

How to do the opposite?

This piece of code

    public class DiagramContainer

    {

    private:

        // Managed reference to some data

        Rigging^ m_rigging;

    };

returns the following error:

Error 1 error C3265: cannot declare a managed 'm_rigging' in an unmanaged 'MFCControls::DiagramContainer'

Hints:
http://www.ondotnet.com/pub/a/dotnet/2003/03/03/mcppp2.html?page=last

Solution:
Use gcroot

    public class DiagramContainer 

    {

    private:

        // Managed reference to some data. gcroot makes it look like an unmanaged type

        gcroot<rigging^ > m_rigging;

    };

m_rigging can be used as a usual Rigging^ object. You reach the members using ->