PDFsharp & MigraDoc Foundation

I have created a little report generator with MigraDocs and PDFsharp. (Latest version!)
Now i have the issue, the user should be able to insert text in the generated PDF-file. As i know it is possible to have formula fields in a PDF-file. (For example if you generated a PDF from an open office document, etc.)
I have look for it in the samples and search wiki + forum, but didn't find any entry.

So the question is there already any object for input fields? Where can i find it?
If not, are there any tips for me to solve this issue?

Thank you very much for possible answers!

BR

P.S.: Really great work with this 2 libraries. Second time i am using them, always a bit confused when i am starting, but one time you get it, it's really easy!!!

I have created an empty page with one big fomular field with open office. Is there any other solution then insert this pdf file via pdfsharp in my migradoc?

(There are some properties i would be happy to modify)

I am glad about any answer!