A widget annotation: the appearance of an interactive form field on a page.
public sealed class PdfWidgetAnnotation : PdfAnnotation
ISO 32000-2 §12.5.6.19, Table 191 (PDF 1.2). A field with one widget may merge both into one dictionary; the field's entries are read through the form field model.
kind:method, kind:property, kind:ctor. Press Esc to clear.ActionGets the action performed when the annotation is activated (A, PDF 1.1), or null.AdditionalActionsGets the actions performed on the annotation's trigger events (AA, PDF 1.2), or null.AppearanceCharacteristicsGets the appearance characteristics dictionary used to construct the appearance (MK), or null.FieldGets the terminal field the widget belongs to: the field whose Kids lists it, or the field merged with it; null when the document has no interactive form or the widget belongs to no field. The same instance the form's field tree holds, whose Widgets lists this widget.HighlightModeGets the visual effect when the widget is activated (H); default invert. T (toggle) reads as push.ParentGets the field dictionary this widget is a kid of (Parent), as stored, or null; required when the field has several widgets.