Display and Plot of surfaces with fill

I’m not able to check if it’s possible with display styles and a single reference, but I imagine it’s easily achieved by stacking 2 different reference files on top of each other. The map file would be lower in the update sequence, would not have the helix visible, and should have a wireframe display style, the helix reference would have only the helix visible and use whatever display style that gives it the necessary filled/shaded appearance.

Have you checked if you have "Fill" activated in the view attributes? 

If it is not activated it does not show fill. 

Andras Dähnrich said:

I need to plot shapes...

What is the exact version no. (e.g. v10.x.y.z) of MicroStation that you are using? Use key-in VERSION to see the version no. in the MicroStation Message Center, or Help→About MicroStation in the backstage.

See this blog that shows you how to obtain MicroStation's version number.