Status: Fixed Owner: Benjamin...@gmail.com New issue 3793 by Benjamin...@gmail.com: MorphTreeMorph >> #addSelectedNodeItem: http://code.google.com/p/pharo/issues/detail?id=3793 addSelectedNodeItem: aNodeItem self selectionAdd: (self nodeMorphsWithNodeItem: aNodeItem). But nodeMorphsWithNodeItem: aNodeItem ^ self allNodeMorphs select: [:m | m complexContents withoutListWrapper = aNodeItem] so if you do treeMorph addSelectedNodeItem: 'test', you get a DNU: Array DNU highlight