Multiple nested canvases in Expression Design xaml output, why?

Just wondering why Expression Blend outputs a path nested in two canvases (rather than just one), I've also seen some with 3 or more but still outputting just one path:

<?xml version="1.0" encoding="utf-8"?>
<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="cross" Width="146.768" Height="146.768" Clip="F1 M 0,0L 146.768,0L 146.768,146.768L 0,146.768L 0,0" UseLayoutRounding="False">
    <Canvas x:Name="Layer_1" Width="146.768" Height="146.768" Canvas.Left="0" Canvas.Top="0">
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Is there any way I can get rid of the extra nested canvases in expression blends outputs?

It makes one for the overall document, essentially the artboard. Then it makes one for each layer you define which is also the same size as the document/artboard. As for getting rid of it, well, there isn't a way to stop Design from adding them to the XAML output. While I am sure this all made perfect sense to the guy that wrote the exporter code, you can usually just delete the outer Canvas and it works better.