https://github.com/gridsuite/gridstudy-app/blob/c1894187139299efb1061849a3a5575e33ad41ac/src/components/report-viewer/report-tree.tsx#L37 let iconClicked = event.target.closest('.MuiTreeItem-iconContainer'); the condition should have been ```java let iconClickedOrKeyboard = !event.realcodetocheckclick() || event.target.closest('.MuiTreeItem-iconContainer'); ``` so that keyboard events still allow expanding/collapsing