XAFWIN: using subreport in XAF application

Hi there
Could you please help me to make this code work?
I'm trying to make use of sub report and filter it in the below code as it printing
using System.Collections;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using DevExpress.ExpressApp.Reports.Win;
using DevExpress.ExpressApp.Reports;
using DevExpress.ExpressApp.Filtering;
using DevExpress.Data.Filtering;
using DevExpress.XtraReports.UI;
using System.Drawing;
using AAAA.Module.Custom;
using AAAA.Module.Data;
private void OnBeforePrint(object sender, System.Drawing.Printing.PrintEventArgs e) {
        XRSubreport subreport = sender as XRSubreport;
        TestLine line = subreport.Report.GetCurrentRow() as TestLine ;
        ReportData reportdata = line.Session.FindObject<CustomReportData>(new BinaryOperator("Name", "SYS0001"));
        XafReport report = reportdata.LoadXtraReport(Application.CreateObjectSpace()); ///We don't have Application.CreateObjectSpace());
        report.SetFilteringObject(new LocalizedCriteriaWrapper(report.DataType, new OperandProperty("Oid") == line.Oid));
                subreport.ReportSource = report;

}
to add sub report we do following
   public class CustomReportData : ReportData
    {
        public CustomReportData(Session session) : base(session) { }
        protected override XafReport CreateReport()
        {
            XafReport report = base.CreateReport();
            report.DesignerLoaded += new DevExpress.XtraReports.UserDesigner.DesignerLoadedEventHandler(report_DesignerLoaded);
            return report;
        }
        void report_DesignerLoaded(object sender, DevExpress.XtraReports.UserDesigner.DesignerLoadedEventArgs e)
        {
            IToolboxService ts = (IToolboxService)e.DesignerHost.GetService(typeof(IToolboxService));
            ts.AddToolboxItem(new ToolboxItem(typeof(XRBarCustomGraph)));
            ts.AddToolboxItem(new ToolboxItem(typeof(XRSubreport)));
        }
    }
Best regards,
Duc Hong Doan