通知图标接收WM_LBUTTONDBLCLK，但不接收WM_CONTEXTMENU

我在我的基于对话框的应用程序中添加了一个通知图标，当图标被双击时，它会收到WM_LBUTTONDBLCLK，但是当图标被右键单击或当图标被键盘突出显示并按下上下文菜单键时，它不会收到WM_CONTEXTMENU。我基于Windows 7.1 SDK示例中的示例来使用通知图标。所以，我不知道我哪里出错了，也不知道为什么这不起作用。

注意:如果我改变WM_CONTEXTMENU到WM_RBUTTONUP，它接收事件，但光标坐标是错误的。

/******************************************************************************/
/* Menu Resource                                                              */
/******************************************************************************/
LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
IDR_TRAYMENU MENU
{
    POPUP ""
    {
        MENUITEM "&Show Status Window", IDM__SHOW_STATUS_WINDOW
        MENUITEM "&About", IDM__ABOUT
        MENUITEM SEPARATOR
        MENUITEM "&Exit", IDM__EXIT
    }
}
/******************************************************************************/
/* WinMain()                                                                  */
/******************************************************************************/
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
    // ... code unrelated to icon
    // Enable Visual Styles
    InitCommonControls();
    // create the main dialog
    if( NULL == (hWnd=CreateDialog(hInstance,MAKEINTRESOURCE(IDD_MAINDLG),NULL,(DLGPROC)WndProc)) )
    {
        MessageBox( NULL, "Error creating the main dialog!", NULL, MB_OK | MB_ICONERROR );
        return -1;
    }
    // ... code unrelated to icon
    MSG msg;
    while( GetMessage(&msg,NULL,0,0) && IsWindow(hWnd) )
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0; 
}    
/******************************************************************************/
/* WndProc()                                                                  */
/******************************************************************************/
BOOL CALLBACK WndProc(HWND hWndDlg, UINT Message, WPARAM wParam, LPARAM lParam)
{
    switch(Message)
    {
        case WM_INITDIALOG:
        {
            // ... code unrelated to icon
            hIcon = (HICON)LoadImage( GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_DDCMP), IMAGE_ICON, 16, 16, LR_DEFAULTSIZE );
            // Setup the system tray icon
            memset( &nid, 0, sizeof(NOTIFYICONDATA) );
            nid.cbSize = sizeof(NOTIFYICONDATA);
            nid.hWnd = hWndDlg;
            nid.uID = 0xDDC;
            nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP | NIF_SHOWTIP;
            nid.uCallbackMessage = WM_APP + 0xDDC;
            nid.hIcon = hIcon;
            strcpy( nid.szTip, "DDCMP Driver" );
            Shell_NotifyIcon( NIM_ADD, &nid );
            // ... code unrelated to icon
            return true;
        } break;
        case WM_APP + 0xDDC:
        {
            switch( LOWORD(lParam) )
            {
                case WM_CONTEXTMENU:
                {
                    MessageBox( hWndDlg, "This message box never shows up.", NULL, MB_OK | MB_SYSTEMMODAL );
                    HMENU hMenu = LoadMenu(GetModuleHandle(NULL),MAKEINTRESOURCE(IDR_TRAYMENU));
                    if( hMenu )
                    {
                        HMENU hSubMenu = GetSubMenu(hMenu,0);
                        if( hSubMenu )
                        {
                            SetForegroundWindow( hWndDlg );
                            POINT pt = { LOWORD(wParam), HIWORD(wParam) };
                            UINT uFlags = TPM_RIGHTBUTTON;
                            if( 0 != GetSystemMetrics(SM_MENUDROPALIGNMENT) )
                                uFlags |= TPM_RIGHTALIGN;
                            else
                                uFlags |= TPM_LEFTALIGN;
                            TrackPopupMenuEx( hSubMenu, uFlags, pt.x, pt.y, hWndDlg, NULL );
                        }
                        DestroyMenu( hMenu );
                    }
                } break;
                case WM_LBUTTONDBLCLK:
                    if( IsWindowVisible(hWndDlg) )
                        ShowWindow( hWnd, SW_HIDE );
                    else
                        ShowWindow( hWnd, SW_SHOW );
                    break;
            }
            return true;
        } break;
        case WM_CLOSE:
            ShowWindow( hWndDlg, SW_HIDE );
            break;
        case WM_DESTROY:
        case WM_QUIT:
        {
            Shell_NotifyIcon( NIM_DELETE, &nid );
            // ... code unrelated to icon
            return true;
        } break;
    }
    return false;
}

这是Windows 7.1 SDK样例中的WndProc

    LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HWND s_hwndFlyout = NULL;
    static BOOL s_fCanShowFlyout = TRUE;
    switch (message)
    {
    case WM_CREATE:
        // add the notification icon
        if (!AddNotificationIcon(hwnd))
        {
            MessageBox(hwnd,
                L"Please read the ReadMe.txt file for troubleshooting",
                L"Error adding icon", MB_OK);
            return -1;
        }
        break;
    case WM_COMMAND:
        {
            int const wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_LOWINK:
                ShowLowInkBalloon();
                break;
            case IDM_NOINK:
                ShowNoInkBalloon();
                break;
            case IDM_PRINTJOB:
                ShowPrintJobBalloon();
                break;
            case IDM_OPTIONS:
                // placeholder for an options dialog
                MessageBox(hwnd,  L"Display the options dialog here.", L"Options", MB_OK);
                break;
            case IDM_EXIT:
                DestroyWindow(hwnd);
                break;
            case IDM_FLYOUT:
                s_hwndFlyout = ShowFlyout(hwnd);
                break;
            default:
                return DefWindowProc(hwnd, message, wParam, lParam);
            }
        }
        break;
    case WMAPP_NOTIFYCALLBACK:
        switch (LOWORD(lParam))
        {
        case NIN_SELECT:
            // for NOTIFYICON_VERSION_4 clients, NIN_SELECT is prerable to listening to mouse clicks and key presses
            // directly.
            if (IsWindowVisible(s_hwndFlyout))
            {
                HideFlyout(hwnd, s_hwndFlyout);
                s_hwndFlyout = NULL;
                s_fCanShowFlyout = FALSE;
            }
            else if (s_fCanShowFlyout)
            {
                s_hwndFlyout = ShowFlyout(hwnd);
            }
            break;
        case NIN_BALLOONTIMEOUT:
            RestoreTooltip();
            break;
        case NIN_BALLOONUSERCLICK:
            RestoreTooltip();
            // placeholder for the user clicking on the balloon.
            MessageBox(hwnd, L"The user clicked on the balloon.", L"User click", MB_OK);
            break;

        // 
        //
        // As you can very plainly see, the Windows SDK Sample ONLY used WM_CONTEXTMNEU
        // 
        //
        case WM_CONTEXTMENU:
            {
                POINT const pt = { LOWORD(wParam), HIWORD(wParam) };
                ShowContextMenu(hwnd, pt);
            }
            break;
        }
        break;
    case WMAPP_HIDEFLYOUT:
        HideFlyout(hwnd, s_hwndFlyout);
        s_hwndFlyout = NULL;
        s_fCanShowFlyout = FALSE;
        break;
    case WM_TIMER:
        if (wParam == HIDEFLYOUT_TIMER_ID)
        {
            // please see the comment in HideFlyout() for an explanation of this code.
            KillTimer(hwnd, HIDEFLYOUT_TIMER_ID);
            s_fCanShowFlyout = TRUE;
        }
        break;
    case WM_DESTROY:
        DeleteNotificationIcon();
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}