using DataDynamics.ActiveReports.Viewer.Annotations; 
 
private void AddAnnotations() 
{ 
    rptAnno rpt = new rptAnno(); 
    rpt.Run(); 
    this.viewer1.Document = rpt.Document; 
 
    AnnotationBalloon ball = new AnnotationBalloon();
    ball.Color = Color.LightSalmon;
    ball.Alpha = 75;
    ball.Border.Color = Color.Red;
    ball.Text = "Needs Review";
    ball.TextColor = Color.Black;
    ball.LineAligment = System.Drawing.StringAlignment.Center;
    ball.Alignment = System.Drawing.StringAlignment.Center;
    ball.Quadrant = AnnotationBalloon.BallonQuadrant.BottomLeft;

    ball.Attach(3, 3);
    this.viewer1.Document.Pages[0].Annotations.Add(ball);

    ball.Height = 1;
    ball.Width = 1.5f; 
}