private static void OnBarSpacingChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
SpectrumAnalyzer spectrumAnalyzer = o as SpectrumAnalyzer;
if (spectrumAnalyzer != null)
{
spectrumAnalyzer.OnBarSpacingChanged((double)e.OldValue, (double)e.NewValue);
}
}