diff -r 3145aadca3d2 -r 0c551e8818e0 External/Aga.Controls/Tree/Input/InputWithShift.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/External/Aga.Controls/Tree/Input/InputWithShift.cs	Sun May 27 15:16:19 2012 +0000
@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Aga.Controls.Tree
+{
+	internal class InputWithShift: NormalInputState
+	{
+		public InputWithShift(TreeViewAdv tree): base(tree)
+		{
+		}
+
+		protected override void FocusRow(TreeNodeAdv node)
+		{
+			Tree.SuspendSelectionEvent = true;
+			try
+			{
+				if (Tree.SelectionMode == TreeSelectionMode.Single || Tree.SelectionStart == null)
+					base.FocusRow(node);
+				else if (CanSelect(node))
+				{
+					SelectAllFromStart(node);
+					Tree.CurrentNode = node;
+					Tree.ScrollTo(node);
+				}
+			}
+			finally
+			{
+				Tree.SuspendSelectionEvent = false;
+			}
+		}
+
+		protected override void DoMouseOperation(TreeNodeAdvMouseEventArgs args)
+		{
+			if (Tree.SelectionMode == TreeSelectionMode.Single || Tree.SelectionStart == null)
+			{
+				base.DoMouseOperation(args);
+			}
+			else if (CanSelect(args.Node))
+			{
+				Tree.SuspendSelectionEvent = true;
+				try
+				{
+					SelectAllFromStart(args.Node);
+				}
+				finally
+				{
+					Tree.SuspendSelectionEvent = false;
+				}
+			}
+		}
+
+		protected override void MouseDownAtEmptySpace(TreeNodeAdvMouseEventArgs args)
+		{
+		}
+
+		private void SelectAllFromStart(TreeNodeAdv node)
+		{
+			Tree.ClearSelectionInternal();
+			int a = node.Row;
+			int b = Tree.SelectionStart.Row;
+			for (int i = Math.Min(a, b); i <= Math.Max(a, b); i++)
+			{
+				if (Tree.SelectionMode == TreeSelectionMode.Multi || Tree.RowMap[i].Parent == node.Parent)
+					Tree.RowMap[i].IsSelected = true;
+			}
+		}
+	}
+}