Функция CreateWindow не создает дочернее окно

#include "stdafx.h"
#include "1.h"
 
#define MAX_LOADSTRING 100
 
// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
 
TCHAR szChildTitle[] = L"233";                  // The title bar text
TCHAR szChildClass[] = L"657";          // the main window class name
 
// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
ATOM                MyRegisterClass1(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK    ChildWndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
 
int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
 
    // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;
 
    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_MY1, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);
 
    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }
 
    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MY1));
 
    
    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
 
    return (int) msg.wParam;
}
 
 
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
 
    wcex.cbSize = sizeof(WNDCLASSEX);
 
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MY1));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_MY1);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
 
    return RegisterClassEx(&wcex);
}
ATOM MyRegisterClass1(HINSTANCE hInstance)
{
 
    WNDCLASS wcex2;
 
    memset(&wcex2, 0, sizeof(wcex2));
 
    wcex2.style         = CS_HREDRAW | CS_VREDRAW;
    wcex2.lpfnWndProc   = ChildWndProc;
    wcex2.cbClsExtra        = 0;
    wcex2.cbWndExtra        = 0;
    wcex2.hInstance     = hInstance;
    wcex2.hIcon         = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MY1));
    wcex2.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wcex2.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex2.lpszMenuName  = NULL;
    wcex2.lpszClassName = szChildClass;
    //wcex2.hIconSm     = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
 
    return RegisterClass(&wcex2);
}
 
 
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd, hChildWnd;
 
   hInst = hInstance; // Store instance handle in our global variable
 
   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
 
   if (!hWnd)
   {
      return FALSE;
   }
 
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);
 
   hChildWnd = CreateWindow(szChildClass, szChildTitle, WS_CHILDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, hWnd, NULL, hInstance, NULL);
 
   if(!hChildWnd) {MessageBox(hChildWnd,L"Ошибка",L"Ошибка",MB_OK);}
 
   ShowWindow(hChildWnd, SW_SHOW);
   UpdateWindow(hChildWnd);
 
 
   return TRUE;
}
 
 
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
 
    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: Add any drawing code here...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}
 
LRESULT CALLBACK ChildWndProc(HWND hChildWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    //case WM_CREATE:{MessageBox(hChildWnd,"ОШИБКА"); 
    };
    return 0;
}