diff -r 3145aadca3d2 -r 0c551e8818e0 External/Aga.Controls/Tree/Input/ResizeColumnState.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/External/Aga.Controls/Tree/Input/ResizeColumnState.cs	Sun May 27 15:16:19 2012 +0000
@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Forms;
+using System.Security.Permissions;
+using System.Drawing;
+
+namespace Aga.Controls.Tree
+{
+	internal class ResizeColumnState: ColumnState
+	{
+		private Point _initLocation;
+		private int _initWidth;
+
+		public ResizeColumnState(TreeViewAdv tree, TreeColumn column, Point p)
+			: base(tree, column)
+		{
+			_initLocation = p;
+			_initWidth = column.Width;
+		}
+
+		public override void KeyDown(KeyEventArgs args)
+		{
+			args.Handled = true;
+			if (args.KeyCode == Keys.Escape)
+				FinishResize();
+		}
+
+		public override void MouseDown(TreeNodeAdvMouseEventArgs args)
+		{
+		}
+
+		public override void MouseUp(TreeNodeAdvMouseEventArgs args)
+		{
+			FinishResize();
+		}
+
+		private void FinishResize()
+		{
+			Tree.ChangeInput();
+			Tree.FullUpdate();
+			Tree.OnColumnWidthChanged(Column);
+		}
+
+        public override bool MouseMove(MouseEventArgs args)
+        {
+			Column.Width = _initWidth + args.Location.X - _initLocation.X;
+            Tree.UpdateView();
+            return true;
+        }
+
+		public override void MouseDoubleClick(TreeNodeAdvMouseEventArgs args)
+		{
+			Tree.AutoSizeColumn(Column);
+		}
+	}
+}