Silverlight 5 WinRT

  public abstract interface ILanguageFontGroupFactory
 
  public abstract virtual LanguageFontGroup CreateLanguageFontGroup(String languageTag);

  public sealed class LanguageFont
  : __ComObject, ILanguageFont
  public virtual String FamilyName { get; }
  public virtual Double ScaleFactor { get; }
  public virtual FontStretch Stretch { get; }
  public virtual FontStyle Style { get; }
  public virtual UInt32 Weight { get; }

  public sealed class LanguageFontGroup
  : __ComObject, ILanguageFontGroup
  public virtual LanguageFont DocumentHeadingFont { get; }
  public virtual LanguageFont FixedWidthTextFont { get; }
  public virtual LanguageFont ModernDocumentFont { get; }
  public virtual LanguageFont TraditionalDocumentFont { get; }
  public virtual LanguageFont UICaptionsFont { get; }
  public virtual LanguageFont UIHeadingFont { get; }
  public virtual LanguageFont UINotificationsFont { get; }
  public virtual LanguageFont UITextFont { get; }
  public virtual LanguageFont UITitleFont { get; }