"DesignTimeReferences" doesn't return WinMD references which blocks XAML designer

XAML designer has the following code:

``` C#
private static References GetReferences(IHostProject project, out object connectionPointSource)
{
References references = null;
connectionPointSource = null;

Project proj = project.GetDTEProject();
if (proj != null)
{
Properties properties = proj.Properties;
if (properties != null)
{
foreach (Property prop in properties)
{
if (string.Equals(prop?.Name, "DesignTimeReferences", StringComparison.OrdinalIgnoreCase))
{
references = prop.Value as References;
connectionPointSource = references;
break;
}
}
}
}

if (references == null)
{
VSProject vsproj = project.GetVSProject();
if (vsproj != null)
{
references = vsproj.References;
connectionPointSource = vsproj.Events.ReferencesEvents;
}
}
return references;
}

```

This apparently does not return WinMD references for CPS projects. I don't have a good understanding of how this works yet so it needs investigation.