I have an HDA that accommodates a multiparm list. Each multiparm item allows for a group to be made based on a bounding box selection. I can see the bounding box transform and scale UI elems (coordinate arrows, face arrows etc), but they do not edit the box. The UI elems will move with the mouse when selected but snap back to the values in their multiparm data fields. I can edit the box, but only through the value ladder or manual data entry.
See the attached gif as an example.
Is this expected behavior within the multiparm? I would much prefer the handles work in the viewport as they do normally at SOP level. The data entry option is less desirable, though functional.
Any thoughts on where I may have sent this one off course?