get_checked : function (obj, get_all) {
                obj = !obj || obj === -1 ? this.get_container() : this._get_node(obj);
                return get_all || this._get_settings().checkbox.two_state ? obj.find(".jstree-checked") : obj.find("> ul > .jstree-checked, .jstree-undetermined > ul > .jstree-checked");
            },