WPF Path Data creates hole
<p>I am trying to create an X symbol.  I have drawn two thick lines that overlap, but WPF removes the intersection of the symbols - I want a solid "X symbol"</p>

<p><a href="https://i.stack.imgur.com/1T2YC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1T2YC.png" alt="enter image description here"></a></p>

<pre><code> &lt;Path x:Name="CheckIcon"  
      Width="{TemplateBinding Width, Converter={StaticResource mathConverter}, ConverterParameter=*2/3-20}" 
      Height="{TemplateBinding Height, Converter={StaticResource mathConverter}, ConverterParameter=*2/3-20}"  
      Margin="1,1,0,1.5" 
      Opacity="1" 
      Stretch="Fill" 
      Fill="Silver"
      Data="M 0,0 L.2,0 L 1,.8 L .8,1 L 0,.2 L .2, 0 M 1,0 L .8,0 L 0,.8 L .2,1 L 1,.2 L .8, 0"
    /&gt;
</code></pre>