<Polygon xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Points="144 48, 200 222, 53 114, 235 114, 88 222" Stroke="Blue" StrokeThickness="5"> <Polygon.Fill> <RadialGradientBrush> <GradientStop Offset="0" Color="Blue" /> <GradientStop Offset="1" Color="Red" /> </RadialGradientBrush> </Polygon.Fill> </Polygon>