My corridor has a curb and gutter and I want to profile the gutter flow line. I know that at times in the past I've been able to view the profile of a ditch line, so I expected to be able to view the profile of the gutter flow line. Any ideas what might be wrong or how to fix it?

What I've tried should have worked on some of the elements I've done this with, but fail on this:

• Snap to the 3D Linear Element, then click, expecting a pop-up toolbar to show up, which does, but all it allows me to do is access the properties, add that line to a terrain model, or delete it.
• Click on it and cycle through the elements in the area. Same thing.
• Open Profile Model, attempt to select the element, nothing happens. (With or without the corridor level being displayed. With or without the component's level being displayed.)

I'm not even sure what next to try. I did consider constructing a civil line to follow the gutter line but found that I'd have to project the corridor onto the profile. (I guess it's worth doing if I can't find a better way.)