Setting active window

I want to make my window the active window as soon as the mouse passes over it. I tried using SetActiveWindow() and SetForegroundWindow() but those functions didn't do it, they just made the taskbar entry flash. I then did this:

Code:

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	switch (msg)
	{
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;

	case WM_MOUSEMOVE:
		if (hwnd!=GetActiveWindow())
		{
			mouse_event(MOUSEEVENTF_LEFTDOWN,0,0,NULL, NULL);
			mouse_event(MOUSEEVENTF_LEFTUP,0,0,NULL, NULL);
		}
		break;

	default:
		break;
	}

	return DefWindowProc(hwnd,msg,wParam,lParam);
}

And it works fine. Is there a more efficient way to do it? Maybe I'm not using SetActiveWindow() correctly?

When i use multiple forms, i set focus like this(ws is a WinStack that keeps the HWND's):
Window that receives focus:

Code:

case WM_SETFOCUS:
  BringWindowToTop(ws->GetTop());
  SetFocus(ws->GetTop());
  break;

Window that loses focus:

Code:

SetFocus(ws->GetTop());