BPASmartClient/BPASmartClient.CustomResource/UserControls/Quadrilateral.xaml

<UserControl
    x:Class="BPASmartClient.CustomResource.UserControls.Quadrilateral"
    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:local="clr-namespace:BPASmartClient.CustomResource.UserControls"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="30"
    d:DesignWidth="100"
    mc:Ignorable="d">
    <Grid>
        <Canvas
            Name="canvas"
            Width="auto"
            Height="auto"
            SizeChanged="Canvas_SizeChanged">
            <Polygon x:Name="poly" />
        </Canvas>
    </Grid>
</UserControl>