The collapsibleset plugin has the following method:
refresh
update the collapsible setIf you manipulate a collapsible set via JavaScript (e.g. add new collapsible containers), you must call the refresh method on it to update the visual styling.
$( ".selector" ).collapsibleset( "refresh" );
To expand or collapse items in a set, call the respective methods on individual collapsibles. The selector for the collapse method can include multiple items in a set:
$( "#myCollapsibleSet" ).children().trigger( "collapse" );