I know that.
The link you provided me I been to as is worthless
I am add the Annotation Create and Delete stick not commands
The corresponding menu items appear disabled at runtime
<RichTextBox.ContextMenu>
<ContextMenu>
<MenuItem
Command="annotations:AnnotationService.CreateTextStickyNoteCommand"
Header="Add Text Note" />
<!-- Command to Delete an Existing Text Note -->
<MenuItem
Command="annotations:AnnotationService.DeleteStickyNotesCommand"
Header="Remove Text Note" />
</ContextMenu>
</RichTextBox.ContextMenu>