how to change background color of SYBYl?



Dear CCL:
 I want to export a graph from a SYBYL, but the background is black. How can I
 change the color of background from black to white?
 Best regards!
             bxiong $#at#$ mail.shcnc.ac.cn
 Xiong Bin
 Shanghai Institute of Materia Medica, C.A.S.
 phone:021-64311833-222(office)