/// <summary> /// Handles changes to the Progress property. /// </summary> /// <param name="d">SprocketControl</param> /// <param name="e">DependencyProperty changed event arguments</param> private static void OnProgressChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { SprocketControl sprocket = (SprocketControl)d; double oldProgress = (double)e.OldValue; double newProgress = sprocket.Progress; sprocket.OnProgressChanged(oldProgress, newProgress); }