<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">
<Rectangle
Width="100" Height="100"
Stroke="Black" StrokeThickness="1">
<Rectangle.Fill>
<DrawingBrush Viewport="0,0,0.5,0.5" TileMode="Tile">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Geometry="M0,0.1 L0.1,0 1,0.9, 0.9,1z"
Brush="Red" />
<GeometryDrawing Geometry="M0.9,0 L1,0.1 0.1,1 0,0.9z"
Brush="Gray" />
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
</Window>