<Window x:Class="Workspace.DockExample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Workspace" Width="640" Height="480"> <Window.Resources> <GradientStopCollection x:Key="myGradientStops"> <GradientStop Offset="0.0" Color="Blue" /> <GradientStop Offset="0.4" Color="Black" /> <GradientStop Offset="0.5" Color="White" /> <GradientStop Offset="0.6" Color="Black" /> <GradientStop Offset="0.7" Color="Blue" /> </GradientStopCollection> </Window.Resources> <Rectangle Width="175" Height="90" Stroke="Black"> <Rectangle.Fill> <LinearGradientBrush GradientStops="{StaticResource myGradientStops}"></LinearGradientBrush> </Rectangle.Fill> </Rectangle> </Window>