Set Stroke, StrokeThickness for Polygon
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" Height="350" Width="300">
<UniformGrid Columns="3" HorizontalAlignment="Center" VerticalAlignment="Center">
<Polygon Stroke="Black" StrokeThickness="3" Margin="5" Points="40,10 70,80 10,80"/>
<Polygon Stroke="Black" StrokeThickness="3" Margin="5" Points="210,0 50,10 50,50 180,160 60,80 0,20"/>
</UniformGrid>
</Window>
Related examples in the same category