private static void OnRefreshIntervalChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            SpectrumAnalyzer spectrumAnalyzer = o as SpectrumAnalyzer;

            if (spectrumAnalyzer != null)
            {
                spectrumAnalyzer.OnRefreshIntervalChanged((int)e.OldValue, (int)e.NewValue);
            }
        }