private static void CharacteristicStartValue_PropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            CharacteristicControl c = (CharacteristicControl)obj;

            c.CharacteristicValue = (Int32)args.NewValue;
        }
        private static void CharacteristicValue_PropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            CharacteristicControl c = (CharacteristicControl)obj;

            c.OnPropertyChanged("CharacteristicValue");
        }