/// <summary>
/// Property callback.
/// Repaints the chart.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="System.Windows.DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
private static void onPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
ChartControl chartControl = (ChartControl)sender;
chartControl.repaint();
}