Round Line Cap
<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'>
<StackPanel Margin="20" Background="White">
<Polyline Stroke="Blue" StrokeThickness="15" Grid.Row="2" StrokeEndLineCap="Round"
Points="10,10 30,0 50,20 90,10 200,10" >
</Polyline>
</StackPanel>
</UserControl>
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