protected void CreateFakeWnd() { WNDCLASSEX wndClsEx = new WNDCLASSEX(); wndClsEx.Init(); wndClsEx.style = WndClassType.CS_VREDRAW | WndClassType.CS_HREDRAW; wndClsEx.lpfnWndProc = m_DefWndProcDelegate; wndClsEx.cbClsExtra = 0; wndClsEx.cbWndExtra = 0; wndClsEx.hInstance = Kernal32Dll.GetModuleHandle(null); wndClsEx.hIcon = IntPtr.Zero; wndClsEx.hIconSm = IntPtr.Zero; wndClsEx.hCursor = IntPtr.Zero; wndClsEx.hbrBackground = IntPtr.Zero; wndClsEx.lpszClassName = m_WndClsName; wndClsEx.lpszMenuName = null; bool success = User32Dll.RegisterClassEx(ref wndClsEx) != 0; Debug.Assert(success, "RegisterWndClass failed."); UInt32 dwExStyle = ExtendedWndStyle.WS_EX_LAYERED | ExtendedWndStyle.WS_EX_TRANSPARENT | ExtendedWndStyle.WS_EX_NOACTIVATE | ExtendedWndStyle.WS_EX_LEFT; UInt32 dwStyle = WndStyle.WS_VISIBLE | WndStyle.WS_OVERLAPPED; m_FakeWndHandle = User32Dll.CreateWindowEx(dwExStyle , m_WndClsName , null , dwStyle , this.Left , this.Top , m_BgImg.Width , m_BgImg.Height , this.Handle , IntPtr.Zero , Kernal32Dll.GetModuleHandle(null) , IntPtr.Zero ); Debug.Assert(User32Dll.IsWindow(m_FakeWndHandle), "CreateWindowEx failed."); }