Hi Larry, a hidden line drawing will be generated if you have surfaces or solids that are being exported to PDF.

If you only have all wireframe curve objects a hidden line drawing will not be generated and so you won't see the hidden line options like "Generate outlines".

If you put in a solid like a sphere or a box then you should see those options but the "Shaded background" option is for exporting a rendered image with light source shading at the bottom level of the PDF, with vector curves layered on top of it.

Any background images that you might have added under View > Image in MOI will not be exported to PDF neither for wireframe export nor hidden line drawing export. Those background images are meant to be used as a reference image for drawing or tracing. They don't export like regular objects.

But one way you can capture them is with a screenshot, try this:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9787.2

- Michael