private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            CircularProgressBar circle = sender as CircularProgressBar;

            circle.RenderArc();
        }
        private static void OnPercentageChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            CircularProgressBar circle = sender as CircularProgressBar;

            circle.Angle = (circle.Percentage * 360) / 100;
        }