Thanks for the suggestions Alan.
I'm not sure that the plgradient function does quite what I want, but I will 
add wxWidgets implementation of this to my to do list as well.

Mulling this over, I thought that the way this might be fixed would be to 
inform the driver in advance that a shade command was being made, then again 
afterwards that the shade was complete. The driver could then, build up a mask 
during the shade process and then apply colour with this mask at the very end. 
This would allow removal of the horizontal and vertical lines. Providing a 
similar warning of a shades command would allow the lines between the different 
levels to be removed in a similar way.

Any thoughts? 

Phil
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