Positioning Rectangle on a Canvas
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
HorizontalAlignment="Center" VerticalAlignment="Center" Width="200" Height="100">
<Border BorderBrush="Black" BorderThickness="1">
<Grid>
<Rectangle Margin="20, 10, 0, 0" Fill="Green" Width="80" Height="30" HorizontalAlignment="Left" VerticalAlignment="Top" />
</Grid>
</Border>
</Page>
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