[flexcoders] How do I alternate labeling tickmarks on a linechart?

[anthony_morsey]

I want the x-axis to have tickmark labels every 3 tickmarks like this:

_60____63____66____69____72____75____78_


What I get now by default is this:

__60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78


Any help would be appreciated

Tony