public static void SaturationChanged(object o, DependencyPropertyChangedEventArgs e)
        {
            SaturationBrightnessSelector h = (SaturationBrightnessSelector)o;

            h.SetSaturationOffset();
        }
        public static void HueChanged(object o, DependencyPropertyChangedEventArgs e)
        {
            SaturationBrightnessSelector h = (SaturationBrightnessSelector)o;

            h.SetColor();
        }