Adri,
What I thought might work for you is the following.
Draw a section line on the axis of the glass wall and beam
In the Section/Elevation window, draw an arc with the
circle tool the length and curvature of the beam.
Make this curve lay at the center line of the beam in elevation.
Now with another pen color draw a curved line at the center
of the glass in elevation.
Select the two curved lines and invoke TrussMaker.
Trussmaker treats each pen color as a separate component
so you can set the width, height, depth, material, contour pen,
and shape for the beam. Do the same for the glass component.
I believe this will create a symmetrical element with two components.
If you need the glass to set towards the inside or outside plane
of the beam you will have to make two TrussMaker objects.
One for the beam and one for the glass.
Peter Devlin