/// <summary>
        /// Handles changes to the TickStyle property.
        /// </summary>
        /// <param name="d">SprocketControl</param>
        /// <param name="e">DependencyProperty changed event arguments</param>
        private static void OnTickStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SprocketControl sprocket     = (SprocketControl)d;
            PenLineCap      oldTickStyle = (PenLineCap)e.OldValue;
            PenLineCap      newTickStyle = sprocket.TickStyle;

            sprocket.OnTickStyleChanged(oldTickStyle, newTickStyle);
        }