jQuery对话框在多次关闭/打开后显示白色内容

Question

我有以下脚本： -

//--show add server dialog
    $('body').on("click", "#addserver", function () {

        //Make it a dialog box. Note that you don't have to do this every time the button is called, so you might want to make it dialog on document ready or something.

        $("#showserveroptions").dialog({
            title: "Add Exsisting Server",
            width: 600,
            height: 300
        });

        var ajaxCall = $.ajax({
            url: '@Url.Content("~/Rack/showServers")',
            data: {
                rackid: "@Model.Rack.TMSRackID",

            },
            type: 'get',
            success: function (html) {
                $('#showserveroptions').html(html);
                $("#showserveroptions").dialog("show"); //This could also be dialog("open") depending on the version of jquery ui.
            }
        });

     });

在我的asp.net mvc中调用以下操作方法，对于流行的对话框： -

[CheckUserPermissions(Action = "Edit", Model = "Server")]
        [OutputCache(CacheProfile = "NoCache")]
        public PartialViewResult showServers(int rackid)//to display a view insdie the dialog box , for assigning servers to a rack 
        {
            AddServerToRack s = new AddServerToRack { rackID = rackid };
            return PartialView("_showServers", s);



        }

目前该对话框在第一次打开时会正常工作，但在多次关闭/打开后我会有一段时间内容如下; -

有人可以建议吗？ 感谢