Trouble with displaying deep zoom image in Silverlight

Question

I have about as simple an example as possible and for whatever reason the image won't display when I run the Silverlight app. Basically I create the image project in Deep Zoom Composer and export as Empty Project + Source. Then I open that solution and put in the following XAML code, and no image shows in the browser. Any ideas?

<Grid x:Name="LayoutRoot" Background="White">
    <MultiScaleImage Width="400" Height="400"
                       Source="GeneratedImages/dzc_output.xml">

      </MultiScaleImage>

</Grid>