I have a Tab Container that has a reports tab.  this tab allows the user to selecte the report enter the parameters and run the report.  I also have a legacy COM object that creats the PDF/Excel report and then save's it to a directory on the server.  the code below runs fine when not within a tab but when it is inside of a tab the file never is opened in the browser window.

Protected Sub btnGenerateOrders_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles btnGenerateOrders.Click
        Dim tempReportType As String, tempCustID As String, tempStrID As String
        Dim tempFromDate As String
        Dim tempToDate As String
        Dim tempLevelID1 As Integer
        Dim tempStrCode1 As String = ""

        If rptStartDate.Enabled Then
            tempFromDate = rptStartDate.Text
            tempToDate = rptEndDate.Text
        Else
            tempFromDate = "2000-01-01"
            tempToDate = "2000-01-01"
        End If

        tempReportType = ddlAvailableReports.SelectedValue
        tempStrID = "TEST" 'Server.HtmlEncode(Request.Cookies("smReferralCode").Value)

        tempLevelID1 = Server.HtmlEncode(Request.Cookies("attuiAID").Value)

        'tempStrCode1 = "5" 'Server.HtmlEncode(Request.Cookies("smCustomerType").Value)

        Dim oReport As Object
        Dim strPDFFilename As String
        Dim oFileScripting As Object
        Dim strReportPath As String

        oReport = Server.CreateObject("AR_Provider_CloserCoupon_TEST.Exporter")
        'oReport = Server.CreateObject("AR_Provider_CloserCoupon.Exporter")
        'strReportPath = "C:\inetpub\wwwroot\@ATTAgentEntry\externalcloserCoupon\Reports"
        'strReportPath = "C:\Inetpub\wwwroot\@TestSite\@ATTExternalClosercoupon2\Reports"
        strReportPath = "C:\Inetpub\wwwroot\@TestSite\@ATTExternalClosercoupon\Reports"
        'strReportPath = "C:\WINDOWS\system32\Reports"
        oReport.ReportType = 2 'reportType.SelectedValue
        oReport.Connect = "Provider=SQLOLEDB;Persist Security Info=False;User ID=CCCCC;password=BBBBB;Initial Catalog=JJJJ;Data Source=LLLLLL;"
        oReport.FilePath = strReportPath

        strPDFFilename = oReport.DataExport(CType(tempReportType, String), CType(tempStrID, String), CType(tempLevelID1, Integer), CType(tempFromDate, String), CType(tempToDate, String))

        oFileScripting = CreateObject("Scripting.FileSystemObject")

        Dim tempStrPDFFileName As String
        tempStrPDFFileName = Mid(strPDFFilename, InStrRev(strPDFFilename, "\") + 1)
        If oFileScripting.FileExists(strPDFFilename) = True Then
            HttpContext.Current.Response.Clear()
            HttpContext.Current.Response.Buffer = True


            'Response.ContentType = "application/pdf"
            Response.ContentType = "application/octet-stream"
            Response.AddHeader("Content-Disposition", "attachment;filename=" & tempStrPDFFileName)
            Dim vntStream
            vntStream = oReport.ReadBinFile(strPDFFilename)

            oFileScripting = CreateObject("Scripting.FileSystemObject")
            oFileScripting.DeleteFile(strPDFFilename)
            Response.BinaryWrite(vntStream)
            Response.Flush()
            Response.Close()
            'oReport = Nothing
        Else
            'nothing
        End If
    End Sub

 Any help would be a good thing.