Host Win32 Window in WPF Problem

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C++/CLI

C#

WPF

C#4.0

Can anyone help me out ? I am trying to host a Win32 window (black background) but when I compile I get nothing except an empty window with the default colouring.
There is no compilation error whatsoever.

#pragma once
#include "Stdafx.h"
#include <windows.h>

using namespace System;
using namespace System::Windows;
using namespace System::Windows::Interop;
using namespace System::Runtime::InteropServices;

namespace UnmanagedCode
{
	LRESULT WINAPI WndProc (HWND hwnd, UINT msg , WPARAM wParam , LPARAM lParam)
	{
		switch(msg)
		{
		case WM_IME_SETCONTEXT:
			if(LOWORD(wParam)>0)
				SetFocus(hwnd);
			return 0;

		default:
		return DefWindowProc(hwnd,msg,wParam,lParam);
	
		}
	}
	
	static HRESULT InitializeW()
	{
		WNDCLASS wc ;
		wc.style = CS_VREDRAW | CS_HREDRAW;
		wc.lpfnWndProc = WndProc;
		wc.cbClsExtra = 0;
		wc.cbWndExtra = 0;
		wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
		wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
		wc.hInstance = GetModuleHandle(NULL);
		wc.lpszMenuName = 0;
		wc.lpszClassName = L"D3DWindow";
		wc.hbrBackground = CreateSolidBrush(RGB(0,0,0));
		// write function to detect NULL wc
		RegisterClass(&wc);	
		return 0;
	}	
}

namespace WinHost
{
	public ref class MyHwndHost : HwndHost
	{
	protected:
		virtual HandleRef BuildWindowCore(HandleRef hwndParent)override
		{
			HWND hwnd = CreateWindow(L"D3DWindow",
									NULL,
									WS_CHILD|WS_VISIBLE,
									CW_USEDEFAULT , 0,
									800,600,      // use function to obtain
									(HWND)hwndParent.Handle.ToInt32(),
									NULL,
									GetModuleHandle(NULL),
									NULL);         
			if(hwnd == NULL)
				throw gcnew ApplicationException("Fail to  create Window");

			UnmanagedCode::InitializeW();

			return HandleRef(this, IntPtr(hwnd));
		}
		
		virtual void DestroyWindowCore(HandleRef hwnd) override
		{

		}
	};
}

and here's my C# code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Interop;
using System.Runtime.InteropServices;
using WinHost;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void Windows_loaded(object sender, RoutedEventArgs e)
        {
            HwndHost host = new MyHwndHost();
            test.Child = host;

        }
    }
}

Thanks