SkewTransform AngleX: 45 / AngleY: 0 / RenderTransformOrigin: (0.5,0.5)
<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="250" Height="250">
<Rectangle Height="50" Width="50" Fill="#CCCCCCFF"
Canvas.Left="100" Canvas.Top="100" Stroke="Blue" StrokeThickness="2"
RenderTransformOrigin="0.5,0.5">
<Rectangle.RenderTransform>
<SkewTransform AngleX="45" AngleY="0" />
</Rectangle.RenderTransform>
</Rectangle>
</Canvas>
</Window>
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