private void ClickUser(object sender, RoutedEventArgs e)
        {
            if (sender != null)
            {
                MaterialButton materialButton = (MaterialButton)sender;
                string         name           = (string)materialButton.Tag;
                User           user           = mainWindow.Group.users.Find(x => x.name == name);

                userName.Text = name;

                var follows = user.following.Select(x => x.name);
                followsNames.ItemsSource = follows;
                followsLabel.Text        = string.Format(Localization.Get("Superstar.FollowsLabel"), follows.Count());

                IEnumerable <string> followers;
                if (!followersCache.ContainsKey(user))
                {
                    followersCache[user] = mainWindow.Group.users.Where(x => x.following.Contains(user)).Select(x => x.name);
                }
                followers = followersCache[user];
                followerNames.ItemsSource = followers;
                followersLabel.Text       = string.Format(Localization.Get("Superstar.FollowersLabel"), followers.Count());
            }
            else
            {
                userName.Text = "";

                string[] values = new string[0];
                followsNames.ItemsSource = values;
                followsLabel.Text        = string.Format(Localization.Get("Superstar.FollowsLabel"), 0);

                followerNames.ItemsSource = values;
                followersLabel.Text       = string.Format(Localization.Get("Superstar.FollowersLabel"), 0);
            }
        }
        public void Refresh()
        {
            if (mainWindow.Group != null)
            {
                followersCache = new Dictionary <User, IEnumerable <string> >();

                noGroup.Visibility = Visibility.Collapsed;

                names.ItemsSource = mainWindow.Group.users.Select(x => x.name);
                usersLabel.Text   = string.Format(Localization.Get("Superstar.Users"), mainWindow.Group.users.Count());

                ClickUser(null, null);
            }
            else
            {
                noGroup.Visibility = Visibility.Visible;
            }
        }