Gets the widget annotation associated with the interactive form field.
A PdfWidgetAnnotation object that is the widget annotation.
If the Widget property returns null, this field has child fields. Use the PdfInteractiveFormField.Kids property and check the Widget property of the interactive form field’s children.
Starting with v21.1, the PDF Document API ships with the Facade API that allows you to perform various operations on a PDF document without access to its inner structure. Use the PdfWidgetFacade options to change the form field appearance. Refer to the following article for more information: Interactive Forms in PDF Documents.