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