cone cell Gal4-line

[The Scop]

Hi, I am a student in Freiburg, Germany, and I am working on eye
development in Drosophila. Right now I am looking for a GAL4-line with
specific expression in cone cells or, alternatively, secondary pigment
cells. It is important that the line does not show expression in
photoreceptor cells. Does anybody know about the existence of such a line
(and where I could obtain it)?  
A specific promoter would also be useful. 
With best regards, 
Johannes Korn 

Johannes Korn                     johakorn at indy1.biologie.uni-freiburg.de 
Institut fur Biologie III
Schanzlestr.1 79104 Freiburg i. Brsg. 
Germany