The wires are all gray, but model appears in color

I'm working through the INTRO TO CREO BASIC CABLING PROCESS (Creo3) tutorial.   The colors on the solid model parts appear as normal, however the wires (which should be colored) all appear as gray.  The wire colors are all set properly in the wire table.  What setting do I need to change to get the wires to display in color?

Thx