// Update property
private static void OnPropertyChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs eventArgs)
{
ProgressArc arc = sender as ProgressArc;
arc.calculateProgress();
}
// Update progress
private static void OnPercentageChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs eventArgs)
{
ProgressArc arc = sender as ProgressArc;
arc.Angle = (arc.Percentage / 100.0) * 360.0;
}