[R-SIG-Finance] plot.xts/chart_Series, multi.panel and candlesticks

[Mike]

I like to plot two candlesticks charts (e.g. two stocks) stacked in
the same plot.

With plot.xts I found some examples
http://joshuaulrich.github.io/xts/plotting_panels.html
https://github.com/joshuaulrich/xts/issues/140
for using the multi.panel option but only for one-column-data. Since
candlesticks need four columns of data I wonder how to tell plot.xts
which columns to use for panel 1 and which for panel 2.

Given two stocks
getSymbols('AAPL')
getSymbols('MSFT')

Would I have to merge them into a new xts or pass them to plot.xts
separately?

Mike