Using ChangeDisplaySettingsEx

 Detaching the monitor work with this but im facing a problem after the monitor is detached. I don't see it anymore in the windows screen resolution dialog , everytime the monitor detached is hidden from the list.

DEVMODE  DevMode;
ZeroMemory(&DevMode, sizeof(DevMode));
DevMode.dmSize = sizeof(DevMode);
DevMode.dmFields = DM_POSITION | DM_PELSWIDTH | DM_PELSHEIGHT;
Result = ChangeDisplaySettingsEx((LPSTR)DisplayDevice.DeviceName, &DevMode,
                                 NULL,
                                 CDS_UPDATEREGISTRY | CDS_RESET,
                                 NULL);