public class CategoryCustomNode : CustomContentPresenter
{
    // level 0
    private TextElement _name;
    private TextElement _description;
    private ImageElement _img;
    private RowPanel _rw;
    // level 1
    private TextElement _product;

    public CategoryCustomNode()
    {
        // level 0
        // init text elements
        // name
        _name = new TextElement();
        _name.Style = new Style();                    
        // description
        _description = new TextElement();
        _description.Style = new Style();
        _description.Width = 120;
        // init image element
        _img = new ImageElement();
        _img.Style = new Style();
        _img.Size = new Size(70, 50);            
        // init a grid for text elements
        var cp = new ColumnPanel();
        cp.Children.Add(_name);
        cp.Children.Add(_description);
        // init panel for image
        _rw = new RowPanel();
        _rw.Children.Add(cp);
        _rw.Children.Add(_img);
        _rw.Style = new Style();
        _rw.Style.VerticalAlignment = Alignment.Center;
        // level 1
        _product = new TextElement();
        _product.Style = new Style();
    }

    public override string ToolTipText
    {
        get
        {
            return _name.Text;
        }
    }

    public override void SetStyle(TreeNodeCellStyles styles)
    {
        // level 0
        // name 
        _name.Style.Margins = new Thickness(1);
        _name.Style.Font = new Font("Calibri", 10, FontStyle.Bold);
        // description
        _description.Style.Margins = new Thickness(1);
        _description.Style.Font = new Font("Calibri", 9, FontStyle.Italic);
        _description.Style.WordWrap = true;
        // img
        _img.Style.ImageScaling = ImageScaling.Scale;
        _img.Style.ImageAlignment = ImageAlignment.CenterCenter;    
        // level 1
        _product.Style.Font = new Font("Calibri", 10, FontStyle.Bold);
        _product.Style.Margins = new Thickness(2);
        _product.Style.HorizontalAlignment = Alignment.Center;
        _product.Style.VerticalAlignment = Alignment.Center;
    }

    public override void SetValue(object value)
    {
        if (Node.Level == 0)
        {
            var row = (DataSet1.CategoriesRow)Node.GetValue();
            _name.Text = row.CategoryName;
            _description.Text = row.Description;
            var converter = new ImageConverter();
            if (_img.Image != null)
            {
                _img.Image.Dispose();
                _img.Image = null;
            }
            _img.Image = (Image)converter.ConvertFrom(row.Picture);
            // set root panel
            Child = _rw;
        }
        else
        {
            _product.Text = value.ToString();
            // set root element
            Child = _product;
        }
    }
}

public class ProductCustomNode : CustomContentPresenter
{
    // level 0
    private TextElement _count;
    // level 1
    private TextElement _quantityPerUnit;
    private TextElement _unitPrice;
    private TextElement _unitInStock;
    private TextElement _unitsOnOrder;
    private TextElement _reorderLevel;
    private GridPanel _gp;
    private Style _eStyle;

    public ProductCustomNode()
    {
        // level 0
        // count in category
        _count = new TextElement();
        _count.Style = new Style();
        _count.Style.Margins = new Thickness(2);
        // level 1
        // lable style
        var lStyle = new Style();
        lStyle.HorizontalAlignment = Alignment.Far;
        lStyle.Margins = new Thickness(1);
        lStyle.Font = new Font("Calibri", 9, FontStyle.Regular);
        // elements style
        _eStyle = new Style();
        _eStyle.Margins = new Thickness(1);
        _eStyle.Font = new Font("Calibri", 9, FontStyle.Regular);
        // init elements
        _quantityPerUnit = new TextElement(_eStyle.Clone());
        _unitPrice = new TextElement(_eStyle.Clone());
        _unitInStock = new TextElement(_eStyle.Clone());
        _unitsOnOrder = new TextElement(_eStyle.Clone());
        _reorderLevel = new TextElement(_eStyle.Clone());
        // init a grid for text elements
        _gp = new GridPanel();
        _gp.Columns.Add(); // labels
        _gp.Columns[0].Width = 100;
        _gp.Columns.Add(); // text
        _gp.Columns[1].Width = 120;

        _gp.Rows.Add(); // ReorderLevel
        _gp[0, 0].Element = new TextElement(lStyle, "Reorder level:");
        _gp[0, 1].Element = _reorderLevel;
        _gp.Rows.Add(); // UnitPrice
        _gp[1, 0].Element = new TextElement(lStyle, "Unit price:");
        _gp[1, 1].Element = _unitPrice;
        _gp.Rows.Add(); // QuantityPerUnit
        _gp[2, 0].Element = new TextElement(lStyle, "Quantity per unit:");
        _gp[2, 1].Element = _quantityPerUnit;                        

        _gp.Columns.Add(); // labels
        _gp.Columns[2].Width = 100;
        _gp.Columns.Add(); // text
        // UnitsInStock
        _gp[0, 2].Element = new TextElement(lStyle, "Units in stock:");
        _gp[0, 3].Element = _unitInStock;
        // UnitsOnOrder
        _gp[1, 2].Element = new TextElement(lStyle, "Units on order:");
        _gp[1, 3].Element = _unitsOnOrder;

    }

    public override string ToolTipText
    {
        get
        {
            return string.Empty; ;
        }
    }

    public override void SetStyle(TreeNodeCellStyles styles)
    {
        // level 0
        _count.Style.HorizontalAlignment = Alignment.Center;
        _count.Style.VerticalAlignment = Alignment.Center;
        _count.Style.Font = new Font("Calibri", 11, FontStyle.Bold);
        // level 1
        _unitPrice.Style.Font = new Font(_eStyle.Font, FontStyle.Bold);
        if (_unitInStock.Text == "0")
        {
            _unitInStock.Style.ForeColor = Color.Red;
            _unitInStock.Style.Font = new Font(_eStyle.Font, FontStyle.Bold);
        }
        if (_unitsOnOrder.Text == "0")
        {
            _unitsOnOrder.Style.ForeColor = Color.Red;
            _unitsOnOrder.Style.Font = new Font(_eStyle.Font, FontStyle.Bold);
        }
    }

    public override void SetValue(object value)
    {
        if (Node.Level == 0)
        {
            var count = Node.HasChildren ? Node.Nodes.Count : 0;
            _count.Text = count.ToString();
            Child = _count;
        }
        else
        {
            var row = (DataSet1.ProductsRow)Node.GetValue();
            _quantityPerUnit.Text = row.QuantityPerUnit;
            _unitPrice.Text = row.UnitPrice.ToString("C");                
            _unitInStock.Text = row.UnitsInStock.ToString();
            _unitsOnOrder.Text = row.UnitsOnOrder.ToString();
            _reorderLevel.Text = row.ReorderLevel.ToString();
            Child = _gp;
        }
    }
}

// set custom nodes
c1TreeView1.Columns[0].CustomContentPresenter = new CategoryCustomNode();
c1TreeView1.Columns[1].CustomContentPresenter = new ProductCustomNode();