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<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Border BorderThickness="5" BorderBrush="Red">
<Canvas Background="LightBlue"/>
</Border>
</Window>
XX.UpdateLayout();