Activate WPF Window without losing focus on previous opened application/window

I had a WPF window in application which I Activate on some specific scenarios by calling 

MainView.Activate();

and 

MainView.BringIntoView();

 method. it also sets focus on this 'MainView' window.

But my requirement was this window shouldn't getFocus. i.e. my cursor should still remain on previous application(notepad,word etc..)

I tried using MainView.ShowActivated="False" but it didn't work.

then after some help from This link I did following code :

IntPtr HWND_TOPMOST = new IntPtr(-1);
            const short SWP_NOMOVE = 0X2;
            const short SWP_NOSIZE = 1;
            const short SWP_NOZORDER = 0X4;
            const int SWP_SHOWWINDOW = 0x0040;

            Process[] processes = Process.GetProcesses(".");

            foreach (var process in processes)
            {
                IntPtr handle = process.MainWindowHandle;
                if (handle != IntPtr.Zero)
                {
                    SetWindowPos(handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_SHOWWINDOW);
                }
            }

But this only works if My window is minimized andnot working if window is WindowState.Normal and is hiding behind some app(IE etc..). what to do?

thanks in advance

Dheeraj