mootools/mootools-more — pull request #1187 by SunboX (2013-03-06 08:58:56+00:00)
Title: Keep multiple elements open, only close on "click"

Added new config option "keepOpen" to keep multiple elements open (no auto collapsing). To close a element you have to "click" the trigger again.
Defaults to "false", so this won´t be a breaking change.