[GNC] Customising colors on Cash Flow Barchart

[Graham Ward]

I need to change the colors on the standard Cash Flow Barchart. Currently,
'Money In' is Blue, 'Out' is Red and the 'Net Flow' Green. Can I change
these three colors and is it possible to change the Net Flow so that it is
grey above the line and red below i.e. negative?

Thanks.