Shapes Silverlight

    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'>

            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"
    />