$('#tt').tree({
            url: url,
            method: "GET",
            checkbox: true,
            lines: true,
            cascadeCheck: false,
            onCheck: function (node, checked) {
                if (checked) {
                    var node1 = $(this).tree('getParent', node.target);
                    if (node1 != null) {
                        $(this).tree('check', node1.target);
                    }
                } else {
                    var nodeC = $(this).tree('getChildren', node.target);
                        $.each(nodeC, function () {
                            $('#tt').tree('uncheck', this.target);
                        });
                }

            }
        });