Page breaks can be exported and subsequently imported using the "page-break-before: always; " property set of some elements.
Introduce support for break-[before/after] and page-break-[before/after].

This can eventually be extended to support "page-break-before: avoid" to preserve the value of the Paragraph.KeepWithNextParagraph property.
Attached to this item is a sample project demonstrating how an HTML file is imported into a RadFlowDocument, the custom page break string are replaced with Break elements of type PageBreak and then the RadFlowDocument is exported to PDF and DOCX files.