Sub-reports render blank results.

[Craig]

I'm trying to build a report programmatically due to the complexity and dynamic nature of the requirement I am faced with.
The best way I can think is to have one 'shell' report that composes many different child reports.

However when I just try to do a light version of the above with a simple (not data-bound) child report that just prints 'hello world!' I get nothing rendered out. When I run the Child report on it's own I receive the expected results.

Below is my code for the shell report

private Telerik.Reporting.Report Build()
{
    Telerik.Reporting.Report mainReport = new Telerik.Reporting.Report();
    Telerik.Reporting.DetailSection detail = new Telerik.Reporting.DetailSection();

    mainReport.Items.Add(detail);

    Unit unitX = Unit.Inch(0.1);
    Unit unitY = Unit.Inch(0.1);
    SizeU size = new SizeU(Unit.Inch(1), Unit.Inch(0.5));

    List<Telerik.Reporting.Report> childrenReports = new List<Telerik.Reporting.Report>();

    ExecutiveSummarySection executiveSummary = new ExecutiveSummarySection();
    childrenReports.Add(executiveSummary);

    foreach (Telerik.Reporting.Report child in childrenReports)
    {
        Telerik.Reporting.SubReport sub = new Telerik.Reporting.SubReport
        {
            Location = new PointU(unitX, unitY),
            Size = size
        };
        unitY = unitY.Add(Unit.Inch(1));
        Telerik.Reporting.InstanceReportSource childInstanceReportSource = new InstanceReportSource();
        childInstanceReportSource.ReportDocument = child;
        sub.ReportSource = childInstanceReportSource;
        detail.Items.Add(sub);
    }
    detail.Height = Unit.Inch(childrenReports.Count + 2D);
    return mainReport;
    //return executiveSummary;
}

and the 'ExecutiveSumarySection' report:

using AGP.Data.Repositories;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Telerik.Reporting;
using Telerik.Reporting.Drawing;

namespace AGP.Reports
{
    public class ExecutiveSummarySection : Report
    {

        public ExecutiveSummarySection()
        {
            InitializeComponent();
            //DataBindControls();
        }

        private void DataBindControls()
        {
             //going to data bind later to EF5 backed repository
            //ModelContextUnitOfWork uow = new ModelContextUnitOfWork();
            //DocumentEFRepository docRepo = new DocumentEFRepository(uow);

            //this.DataSource = docRepo.All.ToList();
        }

        #region Component Designer generated code
        /// <summary>
        /// Required method for telerik Reporting designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            Telerik.Reporting.Drawing.StyleRule styleRule1 = new Telerik.Reporting.Drawing.StyleRule();
            this.pageHeaderSection1 = new Telerik.Reporting.PageHeaderSection();
            this.detail = new Telerik.Reporting.DetailSection();
            this.pageFooterSection1 = new Telerik.Reporting.PageFooterSection();
            this.panel1 = new Telerik.Reporting.Panel();
            this.textBox1 = new Telerik.Reporting.TextBox();
            ((System.ComponentModel.ISupportInitialize)(this)).BeginInit();
            //
            // pageHeaderSection1
            //
            this.pageHeaderSection1.Height = Telerik.Reporting.Drawing.Unit.Inch(2D);
            this.pageHeaderSection1.Name = "pageHeaderSection1";
            //
            // detail
            //
            this.detail.Height = Telerik.Reporting.Drawing.Unit.Inch(2.1000001430511475D);
            this.detail.Items.AddRange(new Telerik.Reporting.ReportItemBase[] {
            this.textBox1});
            this.detail.Name = "detail";
            //
            // pageFooterSection1
            //
            this.pageFooterSection1.Height = Telerik.Reporting.Drawing.Unit.Inch(2D);
            this.pageFooterSection1.Name = "pageFooterSection1";
            //
            // panel1
            //
            this.panel1.Name = "panel1";
            this.panel1.Size = new Telerik.Reporting.Drawing.SizeU(Telerik.Reporting.Drawing.Unit.Inch(2D), Telerik.Reporting.Drawing.Unit.Inch(1D));
            //
            // textBox1
            //
            this.textBox1.Location = new Telerik.Reporting.Drawing.PointU(Telerik.Reporting.Drawing.Unit.Inch(0D), Telerik.Reporting.Drawing.Unit.Inch(0D));
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new Telerik.Reporting.Drawing.SizeU(Telerik.Reporting.Drawing.Unit.Inch(1.2000001668930054D), Telerik.Reporting.Drawing.Unit.Inch(0.40000024437904358D));
            this.textBox1.Value = "Hello World!";
            //
            // ExecutiveSummarySection
            //
            this.Items.AddRange(new Telerik.Reporting.ReportItemBase[] {
            this.pageHeaderSection1,
            this.detail,
            this.pageFooterSection1});
            this.Name = "Report1";
            this.PageSettings.Margins = new Telerik.Reporting.Drawing.MarginsU(Telerik.Reporting.Drawing.Unit.Inch(1D), Telerik.Reporting.Drawing.Unit.Inch(1D), Telerik.Reporting.Drawing.Unit.Inch(1D), Telerik.Reporting.Drawing.Unit.Inch(1D));
            this.PageSettings.PaperKind = System.Drawing.Printing.PaperKind.Letter;
            this.Style.BackgroundColor = System.Drawing.Color.White;
            styleRule1.Selectors.AddRange(new Telerik.Reporting.Drawing.ISelector[] {
            new Telerik.Reporting.Drawing.TypeSelector(typeof(Telerik.Reporting.TextItemBase)),
            new Telerik.Reporting.Drawing.TypeSelector(typeof(Telerik.Reporting.HtmlTextBox))});
            styleRule1.Style.Padding.Left = Telerik.Reporting.Drawing.Unit.Point(2D);
            styleRule1.Style.Padding.Right = Telerik.Reporting.Drawing.Unit.Point(2D);
            this.StyleSheet.AddRange(new Telerik.Reporting.Drawing.StyleRule[] {
            styleRule1});
            this.Width = Telerik.Reporting.Drawing.Unit.Inch(6D);
            ((System.ComponentModel.ISupportInitialize)(this)).EndInit();

        }
        #endregion

        private Telerik.Reporting.PageHeaderSection pageHeaderSection1;
        private Telerik.Reporting.DetailSection detail;
        private Panel panel1;
        private TextBox textBox1;
        private Telerik.Reporting.PageFooterSection pageFooterSection1;
    }
}

Not totally sure what I'm doing wrong here but I was following many similar examples provided in the forums by Telerik Reporting team on doing this type of report.

[Peter]

Hi Craig,

We have tested the provided method and on our end and the report is shown as expected. Make sure that you use the ReportViewer.ReportSource.

If you need additional assistance please open a support thread and send us a runnable sample that exhibits the unexpected behavior to debug on our end.

Regards,
Peter
Telerik