How Can I Perform Post-Back In Modal Form And It Retain The Popup over parent form.

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C#

ASP.NET

C#4.0

jQuery

jQuery-UI

i want to perform functions in jquerymodal popup in asp.net i load an aspx page in modal dialog but on postback.
i would search people in modal form then selected record will be filled in parent form this is what i want to achieve.searching sorting will be done in modal form.

$("#Loadqty_detl").off("click");
    $(document).on("click", "#Loadqty_detl", function () {
        var dlg1=  $('<div id=DialogDiv>').dialog({
            height: $(document).height() - 100,
            width: $(document).width() - 100,
            appendTo:"form",
            closeOnEscape: true,
            autoOpen: false,
            modal: true,
            title: "Message",
            open: function () {
                $(this).load('Ord_Quantitydetl.aspx');
            },
            show: {
                effect: "blind",
                duration: 500
            },
            hide: {
                effect: "clip",
                duration: 1000
            },
            buttons: {
                Submit: function () {
                    $("[id*=btnmsgOk]").click();
                },
                Close: function () {
                    $(this).dialog("close");
                }
            }
        });
        dlg1.dialog("open");
    });