it's a grid for a child BO on the form of the parent Bo.
The grid is inside a Separator/Separator End (so that it can be hidden conditionally).
Doesn't make any difference what Grid Height, Number or Records per page or unlimited.
Seems to be fine when not enclosed in the separator box. Great.. so I can't hide... or it looks like crap.
I can't spend any more time on it.
Thanks anyway.