hello, I am trying to achieve something like RTInteractionExample>>exampleExpandable but with several levels of expansion: a node with nodes inside with nodes inside and each container node can be "opened" (expanded) or closed. Not sure how to do it and mainly how to resize all the ancestors of a node when an inner node is expanded imagine for example representing the pharo class hierarchy as a single Object node, clicking on the node expand it and shows all its subclasses inside, clicking on a subclass expands it, ... Any suggestion ? nicolas -- Nicolas Anquetil RMod team -- Inria Lille