diff -r 3145aadca3d2 -r 0c551e8818e0 External/Aga.Controls/Tree/NodeControls/NodePlusMinus.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/External/Aga.Controls/Tree/NodeControls/NodePlusMinus.cs	Sun May 27 15:16:19 2012 +0000
@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using Aga.Controls.Properties;
+using System.Windows.Forms;
+using System.Windows.Forms.VisualStyles;
+
+namespace Aga.Controls.Tree.NodeControls
+{
+	internal class NodePlusMinus : NodeControl
+	{
+		public const int ImageSize = 9;
+		public const int Width = 16;
+		private Bitmap _plus;
+		private Bitmap _minus;
+
+		private VisualStyleRenderer _openedRenderer;
+		private VisualStyleRenderer OpenedRenderer
+		{
+			get
+			{
+				if (_openedRenderer == null)
+					_openedRenderer = new VisualStyleRenderer(VisualStyleElement.TreeView.Glyph.Opened);
+				return _openedRenderer;
+
+			}
+		}
+
+		private VisualStyleRenderer _closedRenderer;
+		private VisualStyleRenderer ClosedRenderer
+		{
+			get
+			{
+				if (_closedRenderer == null)
+					_closedRenderer = new VisualStyleRenderer(VisualStyleElement.TreeView.Glyph.Closed);
+				return _closedRenderer;
+			}
+		}
+
+		public NodePlusMinus()
+		{
+			_plus = Resources.plus;
+			_minus = Resources.minus;
+		}
+
+		public override Size MeasureSize(TreeNodeAdv node, DrawContext context)
+		{
+			return new Size(Width, Width);
+		}
+
+		public override void Draw(TreeNodeAdv node, DrawContext context)
+		{
+			if (node.CanExpand)
+			{
+				Rectangle r = context.Bounds;
+				int dy = (int)Math.Round((float)(r.Height - ImageSize) / 2);
+				if (Application.RenderWithVisualStyles)
+				{
+					VisualStyleRenderer renderer;
+					if (node.IsExpanded)
+						renderer = OpenedRenderer;
+					else
+						renderer = ClosedRenderer;
+					renderer.DrawBackground(context.Graphics, new Rectangle(r.X, r.Y + dy, ImageSize, ImageSize));
+				}
+				else
+				{
+					Image img;
+					if (node.IsExpanded)
+						img = _minus;
+					else
+						img = _plus;
+					context.Graphics.DrawImageUnscaled(img, new Point(r.X, r.Y + dy));
+				}
+			}
+		}
+
+		public override void MouseDown(TreeNodeAdvMouseEventArgs args)
+		{
+			if (args.Button == MouseButtons.Left)
+			{
+				args.Handled = true;
+				if (args.Node.CanExpand)
+					args.Node.IsExpanded = !args.Node.IsExpanded;
+			}
+		}
+
+		public override void MouseDoubleClick(TreeNodeAdvMouseEventArgs args)
+		{
+			args.Handled = true; // Supress expand/collapse when double click on plus/minus
+		}
+	}
+}