对话框菜单不响应单击

我使用 MSVC++ 向导创建了一个 win32 应用程序。我添加了一个新的菜单资源，并添加了典型的"文件"->"退出"等。然后我将其添加到 msvc++ 属性下的主对话框中。当我运行表单时，它会在表单上显示菜单，但如果我单击文件，它甚至不会进行悬停，也不会显示退出弹出窗口。它几乎就像它被禁用了一样。我真的认为我不需要添加任何代码。任何帮助，不胜感激。谢谢。

#include "stdafx.h"
#define MAX_LOADSTRING 100
struct _globals {
    HINSTANCE hInst;
    HWND      hWnd;
} g;
LRESULT CALLBACK DialogProc(HWND, UINT, WPARAM, LPARAM);
int APIENTRY wWinMain(_In_     HINSTANCE hInstance,
                      _In_opt_ HINSTANCE hPrevInstance,
                      _In_     LPWSTR    lpCmdLine,
                      _In_     int       nCmdShow)
{
    InitCommonControls();
    g.hInst = hInstance;
    g.hWnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, (DLGPROC)DialogProc);
    if (g.hWnd == NULL) {
        GetLastError();
        return FALSE;
    }
    ShowWindow(g.hWnd, nCmdShow);
    UpdateWindow(g.hWnd);
    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_ACCELLS));
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        if (TranslateAccelerator(g.hWnd, hAccelTable, &msg))
            continue;
        if (IsDialogMessage(g.hWnd, &msg))
            continue;
        // process message
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

LRESULT CALLBACK DialogProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INITDIALOG:
        break;
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            switch (wmId)
            {
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;
    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}