Path with fill rule F1 = NonZero
<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>
<Path
StrokeThickness="10"
Stroke="Black"
Fill="LightGray"
Data="F1
M 50,50 L 50,450 450,450 450,50 50,50 z
M 100,100 L 100,400 400,400 400,100 100,100 z"
/>
</Canvas>
</UserControl>
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