in src/main/resources/SLING-INF/libs/sling/resource-editor/static/js/tree/TreeController.js [209:217]
function(){
if (paths.length>0){
thisTreeController.openElement($("#"+pathElementLi.attr('id')).children("ul"), paths);
} else {
$(thisTreeController.settings.treeAndPropsSelector).jstree('select_node', pathElementLi.attr('id'), 'true');
var target = $('#'+pathElementLi.attr('id')+' a:first');
target.focus();
}
}