Code (C++)

            calendar1.CustomDraw |= CustomDrawElements.ResourceViewItem;
            calendar1.Draw += delegate(object sender, DrawEventArgs e)
                                  {
                                      //propertyGrid1.SelectedObject = e;

                                      if (e.Element == CustomDrawElements.ResourceViewItem)
                                      {
                                          counter++;
                                          ClientApplication.INSTANCE.AppFrame.StatusBar.Status = counter.ToString();

                                          int distance = e.GetDistance(sender as Calendar, e.Item.StartTime.AddHours(3));
                                          if (distance >= 0)
                                          {
                                              e.Graphics.DrawLine(Pens.Aquamarine, e.Bounds.Left + distance, e.Bounds.Top,
                                                                  e.Bounds.Left + distance, e.Bounds.Bottom);
                                          }
                                      }

                                  };
 

Code (C++)

        protected override CreateParams CreateParams
        {
            //NOTE: this is taken from: http://www.angryhacker.com/blog/archive/2010/07/21/how-to-get-rid-of-flicker-on-windows-forms-applications.aspx

            get
            {
                if (ClientApplication.INSTANCE.EnableDoubleBuffer)
                {
                    // Activate double buffering at the form level.  All child controls will be double buffered as well.
                    CreateParams cp = base.CreateParams;
                    cp.ExStyle |= 0x02000000; // WS_EX_COMPOSITED
                    return cp;
                }

                return base.CreateParams;
            }
        }