LinearGradientBrush SpreadMethod=Repeat
<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">
<Canvas Width="150" Height="75" Margin="0,0,0,10">
<Rectangle Width="150" Height="75" Stroke="Black">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0.3,0.5" EndPoint="0.7,0.5" SpreadMethod="Repeat">
<GradientStop Color="White" Offset="0" />
<GradientStop Color="#333333" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Line X1="45" Y1="40" X2="105" Y2="40"/>
</Canvas>
</Window>
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