Public Function IndexOf( _
   ByVal control As ARControl _
) As System.Integer

public System.int IndexOf( 
   ARControl control
)

private void SectionReport1_ReportStart(object sender, System.EventArgs eArgs)
{
    GrapeCity.ActiveReports.SectionReportModel.TextBox t = new GrapeCity.ActiveReports.SectionReportModel.TextBox();
    t.Text="Insert text here.";
    this.Sections[0].Controls.Add (t);
    System.Windows.Forms.MessageBox.Show (this.Sections[0].Controls.IndexOf(t).ToString()); 
}

Private Sub SectionReport1_ReportStart(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.ReportStart
    Dim t As New GrapeCity.ActiveReports.SectionReportModel.TextBox
    t.Text = "Insert text here."
    Me.Sections(0).Controls.Add(t)
    MessageBox.Show(Me.Sections(0).Controls.IndexOf(t))
End Sub