I am puzzled; glass can look like glass in Poser from Poser 5 onwards at least.  Are you having problems setting up a shader for the glass?  I would be happy to provide a free one for you if that's the case, as I would love to see your product look as good as it ought to.  Contact me via PM and I will send you a link to download a pair of MAT poses that will set the glass to look like glass, plus instructions for customising them for your own models.  One MAT will use Poser shaders only, the other will use a texture map and a transparency in case you want dirt on your glass.  Users would need to enable ray tracing but you need to do that for most Poser scenes nowadays anyway.

As I no longer have Poser 5 installed the MATs would work in Poser 6 and later, so you could easily set up your model to work in the same way.  I'll document the procedure for making your own MATs from the ones I pass to you, then you can adapt them for many models.

One thing; if you want glass to look like glass it should have a material zone just for the glass, not share it with other things like the frames.

If you want to see my shader work for glass, look carefully at the promo images for my FA-APV product and my FA-WhisperStar helicopter.  This gives an idea of how varied but realistic I can get glass to look.