lines in stacked bar plot

[#1]

i made a beautiful stacked bar plot

the only problem is that I lose the lines between categories when i export the graph

so I want to make the lines more bold. Any ideas?

example of what i am trying to accomplish, below

* make the white lines in the bar plots more bold/different color

thanks

[#2]

I am not aware of an option to increase the white line thickness.  The only way that I see that might be able to work, would be to use the 

     << add graphics script

capability within JMP, and to add white lines to the graph.