Final:
if (THTtmcb->GetState() == WIDGETSTATE_SELECTED) {
SetWindowPos(window->GetHandle(), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
} else if(THTtmcb->GetState() == WIDGETSTATE_UNSELECTED) {
SetWindowPos(window->GetHandle(), HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}