private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            ProgressButton progress = sender as ProgressButton;

            progress.Render();
        }
        private static void OnValueChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            ProgressButton progress = sender as ProgressButton;

            progress.ArcAngle = (progress.Value * 360) / 100;
        }