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:

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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);
}

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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:

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

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Window that loses focus:

Code:

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SetFocus(ws->GetTop());

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