PdfSharp.Pdf.AcroForms.PdfTextField sealed and internal constructors?

[oconnor0]

Hi,

I'm looking at generating PDF forms with PDFsharp. I noticed that PdfTextField is both sealed and has only internal constructors: https://github.com/empira/PDFsharp/blob/master/src/foundation/src/PDFsharp/src/PdfSharp/Pdf.AcroForms/PdfTextField.cs#L19

It seems from this that PdfAcroField and children are only available for reading from PDFs not for generating new PDFs.

Is this a fundamental limitation? A design choice? A not-yet-implemented situation?