st: backgrounf color in pie graph with 'by' option

["Fouarge.j. " <D.J.Fouarge@uvt.nl>]

Hi, 

I am trying to generate a pie chart of some variables by categories of another variable as in this example:

sysuse auto
gen exp = price > 6000
graph pie exp, over(rep78) by(foreign)

I need the background color to be changed in white. I believe that the way to this is using the graphregion option:

graph pie exp, over(rep78) by(foreign) ///
graphregion(fc(white))

But this leaves the outer graph region green. 
The above command works fine without the 'by'.

Can anyone help?

Thanks,

Didier Fouarge
Tilburg University

(Using Stata 9.1, version 20 Jan 2006)


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