bar plot colors

All,

 

I have a question regarding colors in bar plots.  I want to stack a
total of 18 cost values in each bar. Basically, it is six cost types and
each cost type has three components- direct, indirect, and induced
costs.  I would like to use both solid color bars and bars with the
slanted lines (using the density parameter).  The colors would
distinguish cost types and the lines would distinguish
direct/indirect/induced.  I want the cost types (i.e. colors) to be
stacked together for each cost type.  In other words, I don't want all
of the solid bars at the bottom and all of the slanted lines at the top.


So far, I have made a bar plot with all solid colors and then tried to
overwrite that bar plot by calling barplot() again and putting the white
slanted lines across the bars.  However, I can't get this method to work
while still grouping the cost types together.