Polygon Stretch= UniformToFill
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Microsoft.Samples.Graphics.RectangleExample"
WindowTitle="Rectangle Example">
<Canvas>
<Polygon Height="100" Width="50" Points="0,0 10,10 0,10" Fill="Blue" Stretch="UniformToFill"/>
</Canvas>
</Page>
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