<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="StackPanel vs. DockPanel"> <Grid Width="175" Height="150"> <Rectangle Grid.Row="1" Grid.Column="1" Width="100" Height="100" StrokeThickness="8" Margin="4"> <Rectangle.Fill> <RadialGradientBrush GradientOrigin="0.5,0.5" Center="0.5,0.5" RadiusX="0.5" RadiusY="0.5"> <GradientStop Color="Red" Offset="0" /> <GradientStop Color="Green" Offset="0.45" /> <GradientStop Color="Yellow" Offset="0.85" /> </RadialGradientBrush> </Rectangle.Fill> <Rectangle.Stroke> <RadialGradientBrush GradientOrigin="0.5,0.5" Center="0.5,0.5" RadiusX="0.5" RadiusY="0.5"> <GradientStop Color="Black" Offset="0.95" /> <GradientStop Color="Gray" Offset="0.95" /> </RadialGradientBrush> </Rectangle.Stroke> </Rectangle> </Grid> </Page>