Questions on bsCollapsePanel {shinyBS}

I particulary love this bsCollapsePanel from shinyBS package, it really helps to keep the plots neat when you are able to collapse or expand those panel which the plots are inside.

However, I have 2 questions:
(a) Are we able to have 2 of the panels open when my application is launched?
when I try open = c("ABCD","EFGH"), it still open the first panel.
(b) How to have customized colors for the panel? Are we only allowed for those options of
(primary, danger, warning, info, or success)? It would be great if we can specify colors like
"orange", "yellow", "green" etc.

fluidRow(column(12,bsCollapse(id = "collapseExample", open = "ABCD",
                bsCollapsePanel("ABCD",style="primary",
                  fluidRow(column(12,dygraphOutput('ABCD_dygraph'))),
                  ),
                bsCollapsePanel("EFGH",style="warning",
                  fluidRow(column(12,dygraphOutput('EFGH_dygraph'))),
                  )
            ))),