Use GeometryGroup as the path data
<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'>
<Grid x:Name="LayoutRoot" Background="White">
<Path Fill="Blue" Stroke="Yellow" StrokeThickness="2">
<Path.Data>
<GeometryGroup FillRule="Nonzero">
<RectangleGeometry Rect="30, 30, 100, 50" />
<RectangleGeometry Rect="20, 20, 30, 80" />
<EllipseGeometry Center="60, 60"
RadiusX="100"
RadiusY="50" />
<LineGeometry StartPoint="0,0"
EndPoint="100, 20" />
</GeometryGroup>
</Path.Data>
</Path>
</Grid>
</UserControl>
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