Modal Pop Up pass value to parent page and Post back the parent page

Hi, i have created a web user control and use it as a modal popup where user can select a list of record from grid view and pass back the value to the parent page and postback the parent page so that the parent page can diplay additional info base on the value. I have try with the window.openener but it does not work.Does anyone has any idea ? My coding is as below

Web control gui

Code:

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  Public Sub Show()
        ModalPopupExtenderSearch.Show()

    End Sub

Protected Sub gvCustomer_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gvCustomer.RowCommand


        Dim strCustCode As String
        Dim index As Integer = Convert.ToInt32(e.CommandArgument)
        Dim strBuilder As New StringBuilder


        Try

            If index <= gvCustomer.Rows.Count - 1 Then
                If e.CommandName = "Select" Then

                    strCustCode = CType(gvCustomer.Rows(index).Cells(0).FindControl("lblCustCode"), Label).Text

                    Literal1.Text = strBuilder.ToString()
                    strBuilder.Append("<SCRIPT LANGUAGE=javascript>")
                    strBuilder.Append("window.opener.document.forms(0).submit();")
                    strBuilder.Append("</SCRIPT>")
                    Literal1.Text = strBuilder.ToString()

                End If

            End If

        Catch ex As Exception
            Throw ex
        End Try
    End Sub

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Parent page

Code:

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Protected Sub imgSearch_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles imgSearch.Click
        SearchCustomerWithJob.Show()
    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then

        Else
      ''get customer additional info
      dim strCustomerCode as string
      strCustomerCode = '' get from  SearchCustomerWithJob which is a modal pop up

      PopulateCustInfo(strCustomerCode)

        End If
    End Sub

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I realize this is an old post, but I am facing a very similar issue. Have you solved this issue yet?

Thanks,