jquery ui dialog destroy 后autocomplete失效！

在jquery ui 的dialog弹出窗中使用jquery ui 的autocomplete自动提示功能,首次弹出窗口自动提示有效！每次弹出窗open之前都执行autocomplete，但是
dialog destroy 后autocomplete失效！那位大神知道原因知道原因？            $("#edit").dialog({
                autoOpen: false,
                width: 820,
                height: 420,
                modal: true,
                open: function(event, ui) {
                    $.ajax({
                        url: "UserInfoBLL.GetXingMingList2.acsm",
                        dataType: "json",
                        success: function(data) {
                            sdata = $.map(data.data, function(item) {
                                return {
                                    label: item.XingMing,
                                    value: item.Id
                                }
                            });
                            $("#ShenQingRen1").autocomplete({
                                source: sdata,
                                minLength: 0,
                                autoOpen: false,
                                select: function(event, ui) {
                                    $("#ShenQingRen1").val(ui.item.label);
                                    $("#ShenQingRen").val(ui.item.value);
                                    return false;
                                }
                            });
                        }
                    });
                },
                close: function() {
                    $(this).dialog("destroy");
                },
                buttons: [ {
        text: "确定",
        click: function() {
        }
    },
    {
        text: "取消",
        click: function() {
            $(this).dialog("close");
        }
    }
    ]
            });jQuery UIJavaScriptautocompletedialog