private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularGauge circle = sender as CircularGauge;
circle.RenderArc();
}
private static void OnPercentageChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularGauge circle = sender as CircularGauge;
circle.Angle = (circle.Percentage * 360) / 100;
}