Activate MDI window

[Arjay]

In fact, the app has single instance pattern. So, the issue occur when app is already started, and when user try to start another instance and a system tray balloon is shown, and user click on this volume, and then is fired code from the first post. And didn't work ok, instead of MDI get focus, I saw the app flash the task bar icon few times. So, I have tried this code too:

	ShowWindow(SW_RESTORE);

	HWND hForegdWnd = ::GetForegroundWindow();
	DWORD dwCurID = ::GetCurrentThreadId();
	DWORD dwForeID = ::GetWindowThreadProcessId(hForegdWnd, NULL);

	::AttachThreadInput(dwCurID, dwForeID, TRUE);
	::SetForegroundWindow(m_hWnd);
	::SetFocus(m_hWnd);
	::AttachThreadInput(dwCurID, dwForeID, FALSE);

with the same result.

So what started out as a post wondering why focus can't be set on an MDI application has now turned into a single instance tray notify application?

Clearly it's a bit more complex. That being the case, Victor's ask of a sample app that repros the behavior is probably your best chance of receiving help.