Code

private void flowChart_ArrowCreated(object sender, ArrowEventArgs args)
{
            //get count of Arrows
            int incArrows = args.Arrow.Destination.IncomingArrows.Count;
            int outArrows = args.Arrow.Destination.OutgoingArrows.Count;
            // build new anchor points
            AnchorPointCollection ap = new AnchorPointCollection();
            int incomPat = 100 / (incArrows + 1);
            int outgoPat = 100 / (outArrows + 1);

            // distribute the anchors on the Box
            for (int i = 0; i < incArrows+1; i++)



{
                ap.Add(new AnchorPoint((short)((i+1)*incomPat), 25, true, false, MarkStyle.Circle, Color.Blue));
}
            for (int i = 0; i < outArrows+1; i++)
{
    ap.Add(new AnchorPoint((short)((i+1)*outgoPat), 75, false, true, MarkStyle.Circle, Color.Blue));
}

ap.Add(new AnchorPoint(100,50,true,true, MarkStyle.Cross, Color.Red));

            AnchorPattern pat = new AnchorPattern(ap);
            //assign the new anchor pattern to the Box
            args.Arrow.Destination.AnchorPattern = pat;

            //register all arrows to the new pattern!
            ArrowCollection arCol = args.Arrow.Destination.IncomingArrows;
            int counter = 0;
            foreach (Arrow arrow in arCol)
            {
                arrow.DestAnchor = counter;
                ++counter;
            }
}