in src/main/resources/SLING-INF/libs/sling/resource-editor/static/js/tree/TreeController.js [47:56]
$(thatTreeController.settings.treeAndPropsSelector).on("click", function(e) {
var target = $(e.target);
if (target.hasClass("open-icon")){
thatTreeController.openNodeTarget(e);
} else if (target.hasClass("add-icon")){
thatTreeController.openAddNodeDialog(target.parents("li"));
}else if (target.hasClass("remove-icon")){
thatTreeController.deleteSingleNode(target.parents("li"));
}
});