Hi, I have aTreeMorph := PluggableTreeMorph on: self list: #items selected: #selectedItem changeSelected: #onItemClick:. MyClass>>selectedItem ^ myCollection collect:[:item | PluggableListItemWrapper with: item] When a item is selected, PluggableTreeMorph passes the wrapped item to #onItemClick: Shouldn't it be more consistent to have the instance of PluggableListItemWrapper passed instead ? Laurent Laffont