// Click to display the achievements of this one person
 private void okay_Click(object sender, RoutedEventArgs e)
 {
     // read the achievements from AchievementSystem
     // if this person exists
     if (AchievementSystem.ExistUser(name.Text))
     {
         areYouSomebody.Content = name.Text;
         var state = AchievementSystem.GetAchievementState(name.Text);
         // display the achievments
         HighScore.Content     = state.HighScore.ToString();
         TotalClearBar.Content = state.TotalClearBar.ToString();
         SeqClear.Content      = (state.SeqClear ? "完成" : "还没有");
         HardSurvive.Content   = (state.HardSurvive ? "完成" : "还没有");
     }
     else
     {
         areYouSomebody.Content = "你谁啊?";
         HighScore.Content      = "0";
         TotalClearBar.Content  = "0";
         SeqClear.Content       = "还没有";
         HardSurvive.Content    = "还没有";
     }
 }