Clipping plane, how to disable face fillement of an open section?

Clipping plane, how to disable face fillement of an open section?
When using an clipping plane, my section looks like a solid, while I actually want to let it look like something hollow.

Hi Edward , does your inside surface color have a different color than your outside surface color? That may help in distinguishing the hollowness look.β€”-Mark

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Thank you for responding Mark,
No, it is not because of the color I guess (picture below is in shaded view). Maybe it is important to know, I made it with TSpline, so it is a solid. And when making it a mesh the same problem still occurs.

The thing is , from my understanding Rhino can’t make a solid as your describing. I think it is the same with T-splines.
An example is a cube in Rhino. It is a closed poly surface. It has a volume, but not a mass. β€”-Mark

Thanks Richard, I was at a loss as to help.β€”-Mark

Thank you Richard for responding.
Okay thanks, I made a workaround. Next time I will try your suggestion of 'uncheck β€œshow fills.” ’