diff -r 3145aadca3d2 -r 0c551e8818e0 External/Aga.Controls/Tree/Node.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/External/Aga.Controls/Tree/Node.cs	Sun May 27 15:16:19 2012 +0000
@@ -0,0 +1,257 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Collections.ObjectModel;
+using System.Windows.Forms;
+using System.Drawing;
+
+namespace Aga.Controls.Tree
+{
+	public class Node
+	{
+		#region NodeCollection
+
+		private class NodeCollection : Collection<Node>
+		{
+			private Node _owner;
+
+			public NodeCollection(Node owner)
+			{
+				_owner = owner;
+			}
+
+			protected override void ClearItems()
+			{
+				while (this.Count != 0)
+					this.RemoveAt(this.Count - 1);
+			}
+
+			protected override void InsertItem(int index, Node item)
+			{
+				if (item == null)
+					throw new ArgumentNullException("item");
+
+				if (item.Parent != _owner)
+				{
+					if (item.Parent != null)
+						item.Parent.Nodes.Remove(item);
+					item._parent = _owner;
+					item._index = index;
+					for (int i = index; i < Count; i++)
+						this[i]._index++;
+					base.InsertItem(index, item);
+
+					TreeModel model = _owner.FindModel();
+					if (model != null)
+						model.OnNodeInserted(_owner, index, item);
+				}
+			}
+
+			protected override void RemoveItem(int index)
+			{
+				Node item = this[index];
+				item._parent = null;
+				item._index = -1;
+				for (int i = index + 1; i < Count; i++)
+					this[i]._index--;
+				base.RemoveItem(index);
+
+				TreeModel model = _owner.FindModel();
+				if (model != null)
+					model.OnNodeRemoved(_owner, index, item);
+			}
+
+			protected override void SetItem(int index, Node item)
+			{
+				if (item == null)
+					throw new ArgumentNullException("item");
+
+				RemoveAt(index);
+				InsertItem(index, item);
+			}
+		}
+
+		#endregion
+
+		#region Properties
+
+		private TreeModel _model;
+		internal TreeModel Model
+		{
+			get { return _model; }
+			set { _model = value; }
+		}
+
+		private NodeCollection _nodes;
+		public Collection<Node> Nodes
+		{
+			get { return _nodes; }
+		}
+
+		private Node _parent;
+		public Node Parent
+		{
+			get { return _parent; }
+			set 
+			{
+				if (value != _parent)
+				{
+					if (_parent != null)
+						_parent.Nodes.Remove(this);
+
+					if (value != null)
+						value.Nodes.Add(this);
+				}
+			}
+		}
+
+		private int _index = -1;
+		public int Index
+		{
+			get
+			{
+				return _index;
+			}
+		}
+
+		public Node PreviousNode
+		{
+			get
+			{
+				int index = Index;
+				if (index > 0)
+					return _parent.Nodes[index - 1];
+				else
+					return null;
+			}
+		}
+
+		public Node NextNode
+		{
+			get
+			{
+				int index = Index;
+				if (index >= 0 && index < _parent.Nodes.Count - 1)
+					return _parent.Nodes[index + 1];
+				else
+					return null;
+			}
+		}
+
+		private string _text;
+		public virtual string Text
+		{
+			get { return _text; }
+			set 
+			{
+				if (_text != value)
+				{
+					_text = value;
+					NotifyModel();
+				}
+			}
+		}
+
+		private CheckState _checkState;
+		public virtual CheckState CheckState
+		{
+			get { return _checkState; }
+			set 
+			{
+				if (_checkState != value)
+				{
+					_checkState = value;
+					NotifyModel();
+				}
+			}
+		}
+
+		private Image _image;
+		public Image Image
+		{
+			get { return _image; }
+			set 
+			{
+				if (_image != value)
+				{
+					_image = value;
+					NotifyModel();
+				}
+			}
+		}
+
+		private object _tag;
+		public object Tag
+		{
+			get { return _tag; }
+			set { _tag = value; }
+		}
+
+		public bool IsChecked
+		{
+			get 
+			{ 
+				return CheckState != CheckState.Unchecked;
+			}
+			set 
+			{
+				if (value)
+					CheckState = CheckState.Checked;
+				else
+					CheckState = CheckState.Unchecked;
+			}
+		}
+
+		public virtual bool IsLeaf
+		{
+			get
+			{
+				return false;
+			}
+		}
+
+		#endregion
+
+		public Node()
+			: this(string.Empty)
+		{
+		}
+
+		public Node(string text)
+		{
+			_text = text;
+			_nodes = new NodeCollection(this);
+		}
+
+		public override string ToString()
+		{
+			return Text;
+		}
+
+		private TreeModel FindModel()
+		{
+			Node node = this;
+			while (node != null)
+			{
+				if (node.Model != null)
+					return node.Model;
+				node = node.Parent;
+			}
+			return null;
+		}
+
+		protected void NotifyModel()
+		{
+			TreeModel model = FindModel();
+			if (model != null && Parent != null)
+			{
+				TreePath path = model.GetPath(Parent);
+				if (path != null)
+				{
+					TreeModelEventArgs args = new TreeModelEventArgs(path, new int[] { Index }, new object[] { this });
+					model.OnNodesChanged(args);
+				}
+			}
+		}
+	}
+}