[Browsable(false)]
public ProgressReflector ProgressReflector { get; set; }

<Browsable(False)>
Public Property ProgressReflector As ProgressReflector

using System.Windows.Forms;
using DevExpress.XtraEditors;
using DevExpress.XtraPrinting;
using DevExpress.XtraPrinting.Native;
// ...

private void Form1_Load(object sender, EventArgs e) {
    // Create a report and make it
    // a document source of the document viewer.
    report = new XtraReport1();
    documentViewer1.DocumentSource = report;

    // Create a form to show a progress bar,
    // and adjust its properties.
    Form form = new Form() {
        FormBorderStyle = FormBorderStyle.None,
        Size = new System.Drawing.Size(300, 25),
        ShowInTaskbar = false,
        StartPosition = FormStartPosition.CenterScreen,
        TopMost = true
    };

    // Create a ProgressBar along with its ReflectorBar.
    ProgressBarControl progressBar = new ProgressBarControl();
    ReflectorBar reflectorBar = new ReflectorBar(progressBar);

    // Add a progress bar to a form and show it.
    form.Controls.Add(progressBar);
    progressBar.Dock = DockStyle.Fill;
    form.Show();

    try {
        // Register the reflector bar, so that it reflects
        // the state of a ProgressReflector.
        report.PrintingSystem.ProgressReflector = reflectorBar;
        report.CreateDocument();
    }
    finally {
        // Unregister the reflector bar, so that it no longer
        // reflects the state of a ProgressReflector.
        report.PrintingSystem.ResetProgressReflector();
        form.Close();
        form.Dispose();
    }
}

Imports System.Windows.Forms
Imports DevExpress.XtraEditors
Imports DevExpress.XtraPrinting
Imports DevExpress.XtraPrinting.Native
' ...

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a report and make it
    ' a document source of the document viewer.
    report = New XtraReport1()
    documentViewer1.DocumentSource = report

    ' Create a form to show a progress bar,
    ' and adjust its properties.
    Dim form As New Form()
        form.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
        form.Size = New System.Drawing.Size(300, 25)
        form.ShowInTaskbar = False
        form.StartPosition = FormStartPosition.CenterScreen
        form.TopMost = True

    ' Create a ProgressBar along with its ReflectorBar.
    Dim progressBar As New ProgressBarControl()
    Dim reflectorBar As New ReflectorBar(progressBar)

    ' Add a progress bar to a form and show it.
    form.Controls.Add(progressBar)
    progressBar.Dock = DockStyle.Fill
    form.Show()

    Try
        ' Register the reflector bar, so that it reflects
        ' the state of a ProgressReflector.
        report.PrintingSystem.ProgressReflector = reflectorBar
        report.CreateDocument()
    Finally
        ' Unregister the reflector bar, so that it no longer
        ' reflects the state of a ProgressReflector.
        report.PrintingSystem.ResetProgressReflector()
        form.Close()
        form.Dispose()
    End Try
End Sub