.NET component to flatten PDF annotations

We need a .NET component that will flatten all annotations inside a PDF. We are currently using iTextSharp for other PDF functionality, such as creating and combining PDF documents. iTextSharp allows you to flatten form fields in a PDF, but it does not allow you to flatten other annotations such as markups, text notes, and stamps. The end result once a PDF is flattened needs to be the same as when you execute the flattenPages() command in Adobe Acrobat.? See this article for an example:? <[login to view URL]> The component needs to be built for .NET.? Flattening? annotations in an existing PDF is the only function it needs to perform.