DVT e Language IDE User Guide
Rev. 19.1.32, 20 September 2019
An Extend Annotation indicates that this method/tcm extends a previous layer. A previous layer is in the same struct/unit, in the load order, without considering its kind (is only / is also ...) and without considering when sub-types.
Extend annotations are rectangles on the vertical ruler to the left of the editor, next to the method layer:
Hover an extend annotation to see the previous layer.
Click on an extend annotation to jump to the previous layer.