Rendering Glass objects in DRAFT shaded view is a bit hit and miss. Other objects behind the glass are most of the time not visible in the shaded view.
In the picture below the door and drawer fronts are of glass material. You can see on the left hand view, the shelf behind the glass door is not visible yet the drawer boxes are.
In order to see the glass objects and most importantly see-through them we can set up a filter/exception to un-shade just the glass objects, as shown in the right hand view.
You can set the exception by type, level , filter etc
This way you get the outline of the glass but you can still see-through it.
Note: This method won't work if you have blue tinged glass fronts.