public int StopWindowAlwaysOnTop(int windowHandle) { Console.WriteLine(windowHandle); var isSuccessful = WindowsFunctions.SetWindowPos( new IntPtr(windowHandle), (IntPtr)WindowsFunctions.SpecialWindowHandles.HWND_TOP, 0, 0, 0, 0, WindowsFunctions.SetWindowPosFlags.SWP_NOMOVE | WindowsFunctions.SetWindowPosFlags.SWP_NOSIZE ); return(!isSuccessful?Marshal.GetLastWin32Error() : 0); }