GSTARcad transient graphics

Question

I am trying to create transient graphics like in autocad, but it drops me memory coruption error. I will attach some code that works in autocad but not in GSTARcad. I think that EraseTransients is not working correct.

Does anybody know how to fix it? I know about UpdateTransient function, but it is not what i need for my purposes.

using Gssoft.Gscad.DatabaseServices;
using Gssoft.Gscad.EditorInput;
using Gssoft.Gscad.Geometry;
using Gssoft.Gscad.GraphicsInterface;
using Gssoft.Gscad.Runtime;
using System.Diagnostics;
using acGI = Gssoft.Gscad.GraphicsInterface;

namespace GStarTransient
{ 
    public class Class1
    {
        Editor ed = Gssoft.Gscad.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
        DBObjectCollection markers = null;
        TransientManager tm = acGI.TransientManager.CurrentTransientManager;

        [CommandMethod("trc")]
        public void TransientStart()
        {
            PointMonitorEventHandler handler = null;

            handler = delegate (object sender, PointMonitorEventArgs e)
            {
                Point3d point = e.Context.RawPoint;
                UpdateTransient(point);
            };

            ed.PointMonitor += handler;
        }

        private void UpdateTransient(Point3d point)
        {
            RemoveTransient();
            markers = new DBObjectCollection();

            Line line1 = new Line(Point3d.Origin, point);
            AddTransient(line1);
            Line line2 = new Line(Point3d.Origin, new Point3d(point.X - 50, point.Y, point.Z));
            AddTransient(line2);
        }

        private void AddTransient(Entity entity)
        {
            try
            {
                entity.LineWeight = LineWeight.LineWeight030;
                entity.ColorIndex = 1;
                tm.AddTransient(entity, acGI.TransientDrawingMode.DirectShortTerm, 128, new IntegerCollection());
                markers.Add(entity);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.ToString());
            }
        }

        private void RemoveTransient() 
        {
            try
            {
                if (markers != null)
                {
                    tm.EraseTransients(acGI.TransientDrawingMode.DirectShortTerm, 128, new IntegerCollection());

                    foreach (DBObject dBObject in markers)
                        dBObject.Dispose();

                    markers = null;
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.ToString());
            }
        }
    }
}