PenLineJoin.Bevel
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Orientation="Horizontal"> <StackPanel.Resources> <Style TargetType="{x:Type TextBlock}"> <Setter Property="Canvas.Left" Value="25" /> </Style> <Style TargetType="{x:Type Canvas}"> <Setter Property="Width" Value="150" /> <Setter Property="Margin" Value="12" /> </Style> <Style TargetType="{x:Type Rectangle}"> <Setter Property="Width" Value="100" /> <Setter Property="Height" Value="100" /> <Setter Property="Canvas.Top" Value="50" /> <Setter Property="Canvas.Left" Value="25" /> <Setter Property="Stroke" Value="Black" /> <Setter Property="StrokeThickness" Value="25" /> </Style> </StackPanel.Resources> <Canvas> <TextBlock Text="PenLineJoin.Bevel" /> <Rectangle StrokeLineJoin="Bevel" /> </Canvas> </StackPanel>