if (IsChild(hwnd, msg.hwnd) && msg.message == WM_KEYDOWN && msg.wParam == VK_TAB && GetKeyState(VK_CONTROL) < 0)
{
    NMHDR nmhdr;
    nmhdr.idFrom = GetDlgCtrlID(hwnd);
    nmhdr.hwndFrom = hwnd;
    nmhdr.code = TCN_SELCHANGE;
    SendMessage(hwnd, WM_NOTIFY, (WPARAM)nmhdr.idFrom, (LPARAM)&nmhdr);
}