The VkOutlineASB class, a subclass of VkOutline, provides the same functionality as VkOutline except that it uses an annotated scrollbar. With VkOutlineASB, you can display colored bars in the scrollbar to indicate the positions of highlighted items in the outline.
All functions that VkOutlineASB inherits from VkOutline operate identically. VkOutlineASB provides one additional function, VkOutlineASB::setAnnotation():
void setAnnotation(int attribID, Boolean state)
setAnnotation() determines whether or not the scrollbar displays annotations for a given display highlight. attribID is the attribute identifier returned by setHighlightAttributes() of a particular custom highlight. If state is TRUE, the scrollbar displays annotations for the given display highlight; if state is FALSE, the scrollbar does not display annotations for the given display highlight.