Code

DiagramLink link = new DiagramLink(diagram);
link.OriginConnection = new TreeViewConnectionPoint(
	clickedNode, link, false, clickedItem);
link.DestinationConnection = new TreeViewConnectionPoint(
	newNode, link, true, null);
diagram.Links.Add(link);

link.AutoRoute = false;
link.Dynamic = true;
link.Style = LinkStyle.Polyline;
link.SegmentCount = 1;
 

Code

        public void AddTable(ITable table, TreeViewItem sourceItem)
        {
            TableNode destNode = null;
            if (!_DiagramTables.TryGetValue(table.Name, out destNode))
            {
                destNode = new TableNode(diagram, table);
                destNode.CaptionImage = imgList.Images["Table"];
                _DiagramTables.Add(table.Name, destNode);
                diagram.Nodes.Add(destNode);
            }

            if (sourceItem != null)
            {
                TableItem sourceTableItem = sourceItem.Tag as TableItem;
                DiagramLink link = new DiagramLink(diagram);
                link.OriginConnection = new TreeViewConnectionPoint(sourceTableItem.TableNode, link, true, sourceItem);
                link.DestinationConnection = new TreeViewConnectionPoint(destNode, link, false, null);
                link.AutoRoute = false;
                link.Dynamic = true;
                link.Style = LinkStyle.Polyline;
                link.SegmentCount = 1;
                diagram.Links.Add(link);
            }

            UpdateLinks();
            ArrangeAround(diagram.Nodes[0]);
        }

        private void ArrangeAround(DiagramNode node)
        {
            // node.LayoutTraits[SpringLayoutTraits.Frozen] = true;

            SpringLayout layout = new SpringLayout(500,15f, true, true);
            layout.Anchoring = Anchoring.Reassign;
            layout.Root = node;
            layout.Arrange(diagram);

            node.LayoutTraits.Remove(SpringLayoutTraits.Frozen);
        }

 

Code

    public class TableNode : TreeViewNode
    {
        protected override void SaveToXml(System.Xml.XmlElement xmlElement, XmlPersistContext context)
        {

            base.SaveToXml(xmlElement, context);

        }

        public TableNode(Diagram diagram) : base(diagram)
        {
        }
        public TableNode(Diagram diagram, ITable table)
            : base(diagram)
        {
            Caption = String.Format("{0} (Table)",table.Name);
            CaptionHeight = 5;
            EnableStyledText = true;
            Expandable = true;
            Tag = table;
            Font = new Font("Tahoma", 8, FontStyle.Regular);
            ConnectionStyle = TreeViewConnectionStyle.Node;
            // Fields
            TreeViewItem fieldsItem = new TreeViewItem("Fields") { LabelFont = new Font(Font, FontStyle.Bold), Height = 4 };
            RootItems.Add(fieldsItem);
            foreach (TableField field in table.Fields)
            {
                TreeViewItem fieldItem = new TreeViewItem(field.FieldName);
                fieldItem.LabelFont = new Font(Font, FontStyle.Regular);
                fieldItem.Height = 4;
                fieldItem.Tag = new TableItem() { Field = field, TableNode = this };
                if (field.ForeignTable != null)
                    fieldItem.Label = String.Format("<u>{0}</u>", field.FieldName);
                fieldsItem.Children.Add(fieldItem);
            }

            // Secondaries
            TreeViewItem secondariesItem = new TreeViewItem("Secondaries") { LabelFont = new Font(Font, FontStyle.Bold), Height = 4 };
            RootItems.Add(secondariesItem);
            foreach (TableField field in table.LinkedFromFields)
            {
                TreeViewItem secondaryItem = new TreeViewItem(field.FieldName);
                secondaryItem.LabelFont = new Font(Font, FontStyle.Regular);
                secondaryItem.Height = 4;
                secondaryItem.Tag = new TableItem() { Field = field, TableNode = this };
                secondaryItem.Label = String.Format("<u>{0}</u>", String.Format("{0} - {1}", field.Table.Name, field.Label));
                secondariesItem.Children.Add(secondaryItem);
            }

            Resize(ResizeMethod.AllFieldsAndExpand);
            Resize(Bounds.Width, 80);
        }

        private void Resize(ResizeMethod resizeMethod)
        {
            float newHeight = 80;
            float newWidth = 80;

            switch (resizeMethod)
            {
                case ResizeMethod.AllFieldsAndExpand:
                    ResizeToFitText();
                    return;
                case ResizeMethod.DefaultSize:
                    break;
            }

            Resize(newWidth, newHeight);
            Bounds = new RectangleF(Bounds.X, Bounds.Y, newWidth, newHeight);
        }

        protected override void OnClick(MouseButton mouseButton, PointF mousePosition)
        {
            base.OnClick(mouseButton, mousePosition);

        }


    }