Uri uri = new Uri ("/Fonts;component/Test.TTF", UriKind.RelativeOrAbsolute);
        StreamResourceInfo info = Application.GetResourceStream(uri);
        FontSource fs = new FontSource(info.Stream);

        PageTitle.FontFamily = new FontFamily("Agency FB");
        PageTitle.FontSource = new FontSource (info.Stream);
        PageTitle.FontSize = 72;