ScaleX: 0.5 /ScaleY: 0.5 /Center: (25,25)
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Canvas Width="250" Height="250">
<Rectangle Height="50" Width="50" Fill="#CCCCCCFF"
Stroke="Blue" StrokeThickness="2"
Canvas.Left="100" Canvas.Top="100">
<Rectangle.RenderTransform>
<ScaleTransform CenterX="25" CenterY="25" ScaleX="0.5" ScaleY="0.5" />
</Rectangle.RenderTransform>
</Rectangle>
<Rectangle Style="{StaticResource MarkerRectangleStyle}" />
</Canvas>
</UserControl>
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