The green lines in the Cadence Symbol Editor are drawn on the
system layer purpose pair (lpp) 'device drawing', which is assigned to
the display packet 'green' in the technology file.

If you want to change the color of them you have to assign a other
display packet to 'device drawing' lpp in your technology file.
But this changes the color appearance of every shape drawn with the
lpp 'device drawing' no mater if it is for symbols,
schematics or layouts.

No other way around this!
Have a look at:
http://sourcelink.cadence.com/docs/db/kdb/2004/Aug/11150798.html
For what reason do you need white lines?

Bernd

Thank you! I only wnat to draw a A4 pattern to describe the schematic.