[PyMOL] Filled Aromatic Rings in Heteroligands ??

Hi Everyone,
I have a ligand containing aromatic rings (pyrroles, imidazoles). I'd like to 
show them as "filled" or "shaded" rings in the stick representation mode.
Could anyone suggest how to go about doing it in Pymol ?
Thanks very much,
Raji

Raji Edayathumangalam
Dept. of Biochemistry & Molecular Biology
Colorado State University
Fort Collins, CO 80523 USA
Tel:(970)491-4614
Fax:(970)491-0494