verticalworks

I am looking to share a file with a customer but would like to send as a .pdf so they can turn the layers on and off. I do this all the time with AutoCad but when I export the Chief file as a .dwg then go to create a .pdf, the layer are created in the .pdf but they do not show on the screen. The layer properties are checked to show but the page is blank. Is this a problem with the .dwg export in Chief?