Do you only want the annotations shown in a ThumbnailView or do you want to show a thumbnail of the image with its annotations?
Our installer includes a demo with source named "Document Annotation Demo" which provides a way to add annotations to thumbnail images.
If you only want the individual annotation objects to show as separate thumbnails, then you will have to generate the thumbnails manually and use each annotation's rendering engine to draw it onto the thumbnail image.
Glenn Chittenden Jr.
Atalasoft Development Team