Why TrackPopupMenu API does not work within a thread?

[Chris]

I have the following code and it show that the TrackPopupMenu is not working as expected.

DWORD WINAPI PopupMenuThread(LPVOID pParam)
{
    DWORD    id;
    POINT    pt;
    HMENU    hMenu2;

    hMenu2 = CreatePopupMenu();
    AppendMenu(hMenu2, MF_STRING, ID_OPTION_INFORMATION2, "Information 2");
    AppendMenu(hMenu2, MF_STRING, ID_OPTION_RESERVATION2, "Reservation 2");
    AppendMenu(hMenu2, MF_SEPARATOR, 0, NULL);
    AppendMenu(hMenu2, MF_STRING, ID_OPTION_GAMES2, "Games 2");

    GetCursorPos(&pt);
    id = TrackPopupMenu(hMenu2, TPM_RETURNCMD | TPM_TOPALIGN, pt.x, pt.y, 0, hWndMain, NULL);
    switch(id)
    {
        case ID_OPTION_INFORMATION:
            MessageBox(hWndMain, "1", "###", MB_OK);
            break;
        case ID_OPTION_RESERVATION:
            MessageBox(hWndMain, "2", "###", MB_OK);
            break;
        case ID_OPTION_GAMES:
            MessageBox(hWndMain, "3", "###", MB_OK);
            break;
        default:
            break;
    }

    DestroyMenu(hMenu2);

    return 0;
} 

Can someone give me some hints on how to resolve this?

regards,