System.Object
   System.Collections.ObjectModel.Collection<T>
      Xfinium.Pdf.View.Annotations.PdfVisualAnnotationCollection
   Xfinium.Pdf.View.Annotations.PdfVisualAnnotation
      Xfinium.Pdf.View.Annotations.PdfVisualFreeTextAnnotation
      Xfinium.Pdf.View.Annotations.PdfVisualLinkAnnotation
      Xfinium.Pdf.View.Annotations.PdfVisualMarkupAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualCircleAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualFileAttachmentAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualInkAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualLineAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualPolylineAnnotation
            Xfinium.Pdf.View.Annotations.PdfVisualPolygonAnnotation
               Xfinium.Pdf.View.Annotations.PdfVisualCloudPolygonAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualRubberStampAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualSquareAnnotation
            Xfinium.Pdf.View.Annotations.PdfVisualCloudSquareAnnotation
         Xfinium.Pdf.View.Annotations.PdfVisualTextAnnotation
      Xfinium.Pdf.View.Annotations.PdfVisualTextMarkupAnnotation
      Xfinium.Pdf.View.Forms.PdfVisualFieldWidget
         Xfinium.Pdf.View.Forms.PdfVisualCheckWidget
            Xfinium.Pdf.View.Forms.PdfVisualCheckBoxWidget
            Xfinium.Pdf.View.Forms.PdfVisualRadioButtonWidget
         Xfinium.Pdf.View.Forms.PdfVisualComboBoxWidget
         Xfinium.Pdf.View.Forms.PdfVisualListBoxWidget
         Xfinium.Pdf.View.Forms.PdfVisualPushButtonWidget
         Xfinium.Pdf.View.Forms.PdfVisualSignatureWidget
         Xfinium.Pdf.View.Forms.PdfVisualTextBoxWidget

Reference

Xfinium.Pdf.View.Win Assembly