st: Bar graph: bar colors across -by()- and -over() graphs do not match

[Marco Antonielli <antoniellimarco@gmail.com>]

Hi,
My name is Marco.

I am doing a bar graph using the options -over()- and - by()-. Follows
the code I am using:

graph bar (asis) comp_share_Rank1  comp_share_Rank2 comp_share_Rank3
comp_share_Rank4 ///
comp_share_Rank5 comp_share_Rank6 comp_share_Rank7 comp_share_Rank8
comp_share_Rank9 ///
comp_share_Others if marketshare==1 & year==2010 & category==1, ///
over(country) stack cw by(subcategory) ///
bar(1, color(navy)) bar(2, color(navy*0.9)) ///
bar(3, color(navy*0.8)) bar(4, color(navy*0.7)) bar(5,
color(navy*0.6)) bar(6, color(navy*0.5)) ///
bar(7, color(navy*0.4)) bar(8, color(navy*0.3)) bar(9,
color(navy*0.2)) bar(10, color(navy*0.1))

I have then 5 bar graphs. However the colors of the 10 columns in the
5 graphs is not consistent, ie the second graph has softer colors than
the first on and so on.

Any suggestion on how to solve the issue?
Thank you!
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