Ployline types do not require connecting ends
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WpfApplication1" Height="352" Width="334" WindowStartupLocation="CenterScreen">
<StackPanel>
<Polyline Stroke ="Red" StrokeThickness ="20" StrokeLineJoin ="Round"
Points ="10,10 40,40 10,90 300,50"/>
</StackPanel>
</Window>
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