We are a lighting design firm that uses AutoCAD 2007. When I xref in a drawing that has been drawn in ArchiCAD and change all xref layers to grey, the model space drawing does not show up as grey. I have been bringing in the xref on the "0" layer. I have tried copying the ArchiCAD drawing into an AutoCAD drawing before externally referencing it, but nothing works. The only way that I can get the entire background to turn grey is to explode the original drawing and turn it grey before referencing it in. Is there a better way to do this where I am not manipulating the original drawing? Any tricky settings that I don't know about?