[DllImport("user32.dll", EntryPoint = "CallWindowProcA")]
        public static extern int callWindowProc(int lpPrevWndFunc, int hwnd, int Msg, int wParam, int lParam);
        [DllImport("user32.dll", EntryPoint = "SetWindowLongA")]
        public static extern int setWindowLong(int hwnd, int nIndex, int dwNewLong);

        public delegate int SubClassProcDelegate(int hwnd, int msg, int wParam, int lParam);
        DllImport("user32.dll", EntryPoint = "SetWindowLongA")]
        public static extern int delegateSetWindowLong(int hwnd, int attr, SubClassProcDelegate lval);