The Bookmark dialog enables end-users to add a new bookmark, delete an existing bookmark or scroll to the location marked with a selected bookmark.
End-users can invoke this dialog using the Bookmark button on the Insert ribbon tab. Refer to the Lesson 1 - Create a Simple Rich Text Editor for details on how to provide the ribbon ui to the RichEditControl. Executing the ShowBookmarkFormCommand command invokes this dialog as well.
The dialog is also available from the context menu.