[R-SIG-Finance] chart_Series.R question

[E Pan]

Dear list,
up.col=NA, is in the default argument for chart_theme,
this causes ohlc charts to be incorrectly drawn with chart_Series(up
bars won't show up)

any idea why it is set to NA as default?

I am exploring options to color each bar in ohlc charts per value of
technical indicators. am I in the right direction in exploring
chart_Series.R?

Thanks List!!
Jim