SHADEDGE system variable
Function Description:
The SHADEDGE system variable is used to control the shading of edges.
Type : Integer 
Saved in : Drawing 
Initial value : 3 
Range : 0,1 ,2,3
System Variable Value:
0 : shade faces but do not highlight edges 
1 : shade faces and draw edges by background color
2 : do not hatch faces but draw edges by object color
3 : shade faces by object color and draw edges by background color