title: The name XXX does not exist in the namespace YYY (XAML VS12 Windows 8)
body: <p>So I'm working in VS12 on Windows 8, and hacking the ContosoCookbook code to make a different app.
  I'm trying to set up a "MainMenu.xaml" page and in  I have:</p>
  
  <pre><code>        &lt;CollectionViewSource
          x:Name="groupedItemsViewSource"
          Source="{Binding Groups}"
          IsSourceGrouped="true"
          ItemsPath="TopItems"
          d:Source="{Binding AllGroups, Source={d:DesignInstance Type=data:FlashCardDataSource, IsDesignTimeCreatable=True}}"/&gt;
  </code></pre>
  
  <p>The error I'm getting is:
  The name "FlashCardDataSource" does not exist in the namespace "using:FlashCards.Data".</p>
  
  <p>...but I don't understand how it doesn't.  Where do I start looking?  I'm new at XAML.</p>
  
  <p>-Ken</p>