parent window and chlid window

I have asp.net ajax tab. in one of the ajax tab.. I m having this link and the gridview

  Dim i As Integer = Session("Productid")
                LinkButton5.Attributes.Add
<div class="first last">("onclick", "javascript:OpenWin('" + i.ToString + "')")

 <script type="text/javascript">
       //window.onload = parent.frames(0).document.getElementById('lblMenuTitle').innerHTML  = 'Location'        
       function OpenWin(id) {
           var url = 'RelatedProducts.aspx?ID=' + id
           window.open(url, 'newWindow', 'width=600,height=200,scrollbars=yes')
           return false;
       }
    </script>




where it popups a new window.. I will select the records and save it, once it is saved
the window will get closed

 Page.ClientScript.RegisterStartupScript(Me.GetType(), "close", "<script language=javascript>window.opener.location.href = 'simpleadd.aspx';self.close();</script>")

But the problem here.. I dont want to refresh my whole page(parent page)..
rather than im looking to refresh only certain portion, where add new records can be displayed in the gridview. Thanks