private void ButtonLink_Click(object sender, RoutedEventArgs e)
        {
            var btn = e.OriginalSource as Button;

            if (btn == null)
            {
                return;
            }

            var ua = btn.Tag as UserAction;

            if (ua == null)
            {
                return;
            }

            btn.IsEnabled = false;
            var user = ua.user;

            if (ua.action == UserAction.Action.Play)
            {
                Process.Start(user.videoPlayUrl);
                AddStatus($"Play : {user.nickname} ({user.mid})");
            }
            else
            {
                AddStatus($"Open : {user.nickname} ({user.mid})");
                var window = new UserWindow(user);
                window.Show();
            }
            btn.IsEnabled = true;
        }
        private void ButtonFind_Click(object sender, RoutedEventArgs e)
        {
            var window = new UserWindow(null);

            window.Show();
        }