Rectangle with RadiusX and RadiusY
<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 x:Name="LayoutRoot" Background="White" >
<Rectangle Height="151" Width="237"
Opacity="0.6" Fill="#FF434343" Stroke="#FF000000" RadiusX="24" RadiusY="24"/>
</Canvas>
</UserControl>
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