If you are creating a shaded box lets say 300 x 700 pixels, you would issue <esc>*c700a300b2P<esc>*c15G
The <esc>*c15G specifies a 15% shading.
If the intended fill was a crosshatch, then the fill would represent the type of crosshatch pattern rather than the shading level.
See the PCL5 Technical Reference.
Jim Asman
jlasman@telus.net