Grading Group - (Surface by slope; Lines not showing up)

[Anonymous]

Hello.

I'm trying to create a dam using grading group. With 2 Featurelines (edge of  dam) and sloping 1:2 to existing surface.

However, the line where it daylights is not showing up.

It will, however, show up when you go use object viewer.

Even creating a surface from the grading group will still work. 

I was thinking of a workaround to just go to surface properties and show border of the surface.

But I really wouldn't want to do it that way.

Has anyone of you had this problem before?

Thanks.