void CALLBACK WinEventProc(HWINEVENTHOOK hook, DWORD event, ...) {
if (event == EVENT_SYSTEM_MINIMIZEEND)
{
::SetWindowPos(g_hMain, HWND_NOTOPMOST, 0, 0, 0, 0, ZPOS_FLAGS);
::SetWindowPos(g_hMain, HWND_BOTTOM, 0, 0, 0, 0, ZPOS_FLAGS);
}

if (event == EVENT_SYSTEM_MINIMIZESTART)
{
::SetWindowPos(g_hMain, HWND_TOPMOST, 0, 0, 0, 0, ZPOS_FLAGS);
}
}

SetWinEventHook(EVENT_SYSTEM_MINIMIZESTART, EVENT_SYSTEM_MINIMIZEEND, nullptr, WinEventProc, ...)