Polygon Stretch= UniformToFill
<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>
<Polygon Height="100" Width="50" Points="0,0 10,10 0,10" Fill="Blue" Stretch="UniformToFill"/>
</Canvas>
</UserControl>
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