How to hide an interface implementation ?

Question

// C++/CX component.

public interface class IResource
{
void Destroy( );
};

public ref class View sealed : public IResource
{

public :

virtual void _Destroy( ) = IResource::Destroy; // Explicit.
}

// C# client.

View v = new View( );

( ( IResource )v )._Destroy( ) // I was expected something like this to hide my method.

v._Destroy( ) // But I can still call the method implicitly without a cast !