hlr display - remove common edge

Find attached a brep of two boxes fused.
Checked the display in 6.5.2 test harness.
# vdisplay S
# vsetdispmode S 2
to get the HLR display. Fine and the 'middle' common edge is not visible.
I need the similar behavior using the class HLBRep_HLRShape.
What functions need to be used to extract similar result ?
- PG

Attachments: 
PG's picture

The issue is visualization of the middle edge is visible in wireframe if using the new BOP boolean API, but a single face
i shown with the very old Algo API. This is the usual display
in all CAD s/w. How to get it with the new BOP boolean API.
- PG