SiteMapPath not displaying

I'm having some trouble using the SiteMapPath control. When I drag the control onto the page and run it nothing displays. If I use the SiteMapDataSource with the Menu or TreeView Controls I see my menu but, I'm trying to implement breadcrumb navigation so those controls will not work. From what I've read SiteMapPath seems to be the control that I want to use but I can't seem to get it to work. Below is my web.sitemap:
<?xml version="1.0" encoding="utf-8" ?> <siteMap> <siteMapNode title="Home" description="Home" url="Default.aspx"> <siteMapNode title="Resources" description="News &amp; Articles" url="~/resources"> <siteMapNode title="Current Article" description="" url="~/resources/mypage" /> </siteMapNode> </siteMapNode> </siteMap> And the control is simply:
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