public class HackWindowsForms
    {
        struct POINTAPI
        {
            public int X;
            public int Y;
        }

        [DllImport("user32.dll")]
        static extern int EnumChildWindows(int hWndParent, EnumChildCallbackDelegate enumChildCallback, int lParam);
        [DllImport("user32.dll")]
        static extern int EnableWindow(int hwnd, int fEnable);
        [DllImport("user32.dll")]
        static extern int WindowFromPoint(int x, int y);
        [DllImport("user32.dll")]
        static unsafe extern int GetCursorPos(POINTAPI* lpPoint);

        delegate int EnumChildCallbackDelegate(int hwnd, int lParam);

        public static void EnableThisWindowControls()
        {
            unsafe
            {
                POINTAPI cursorPosition = new POINTAPI();
                GetCursorPos(&cursorPosition);
                int winWnd = WindowFromPoint(cursorPosition.X, cursorPosition.Y);
                EnumChildWindows(winWnd, EnumChildCallback, 0);
            }
        }


        static int EnumChildCallback(int hwnd, int lParam)
        {
            EnableWindow(hwnd, 1);
            EnumChildWindows(hwnd, EnumChildCallback, 0);
            return 1;
        }
    }

        private void button1_MouseUp(object sender, MouseEventArgs e)
        {
            HackWindowsForms.EnableThisWindowControls();
            MessageBox.Show("حالا روی دکمه مورد نظر کلیک کنید و کلید space را فشار دهید.", "", MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1, MessageBoxOptions.RtlReading);
        }