StrokeStartLineCap=Triangle
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Microsoft.Samples.Graphics.RectangleExample"
WindowTitle="Example">
<Canvas>
<Polyline
Points="50,50 75,30 100,100 130,40"
Stroke="Red"
StrokeThickness="20"
StrokeStartLineCap="Triangle"
StrokeEndLineCap="Triangle"
Grid.Row="4" Grid.Column="4"/>
</Canvas>
</Page>
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