private static IntPtr ShellProc(int code, IntPtr wParam, IntPtr lParam)
        {
            if (code == PI.HSHELL_REDRAW)
            {
                try
                {
                    if (_forms.TryGetValue(wParam, out Form f))
                    {
                        FlashEvent(f, (int)lParam == 1);
                    }
                }
                catch
                {
                    //
                }
            }

            return(PI.CallNextHookEx(_hHook, code, wParam, lParam));
        }