<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="300" Width="400">
<UniformGrid Columns="3" HorizontalAlignment="Center" VerticalAlignment="Center">
<Polyline Margin="10" Stroke="DarkCyan" StrokeThickness="8" StrokeLineJoin="Bevel" Points="10,0 100,10 100,100 0,100 10,20 80,20 80,80 20,80, 120,40 60,40 60,60 40,60" />
</UniformGrid>
</Window>