<UserControl x:Class="NAudioWpfDemo.SpectrumAnalyser"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    >
    <Canvas Background="Black">
        <Polyline x:Name="polyline1" Stroke="Yellow" StrokeThickness="1"/>
    </Canvas>
</UserControl>
