public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            int score = (int)value;
            int mod   = RuleBook.CalcModFromAbilityScore(score);

            return((mod >= 0 ? "+" : "") + mod.ToString());
        }
 private void UpdateHitPoints()
 {
     if (IsInitialized)
     {
         HPLabel.Content = RuleBook.CalculateHitPoints(Character);
     }
 }