Request for adding API support for Shapes.
GemBox.Document supports Shapes only through the preservation in DOCX files.
This means that these elements are preserved so we don't lose any document content when loading and saving a document to a DOCX file, but they are not directly supported by GemBox.Document API.
More information about GemBox.Documents's preservation can be found on the following link:
Mario at GemBox
This feature request has been implemented and is available in the latest versions of GemBox.Document.