diff -r 3145aadca3d2 -r 0c551e8818e0 External/Aga.Controls/Tree/NativeMethods.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/External/Aga.Controls/Tree/NativeMethods.cs	Sun May 27 15:16:19 2012 +0000
@@ -0,0 +1,74 @@
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+
+namespace Aga.Controls.Tree
+{
+    internal static class NativeMethods
+    {
+        public const int DCX_WINDOW = 0x01;
+        public const int DCX_CACHE = 0x02;
+        public const int DCX_NORESETATTRS = 0x04;
+        public const int DCX_CLIPCHILDREN = 0x08;
+        public const int DCX_CLIPSIBLINGS = 0x10;
+        public const int DCX_PARENTCLIP = 0x20;
+        public const int DCX_EXCLUDERGN = 0x40;
+        public const int DCX_INTERSECTRGN = 0x80;
+        public const int DCX_EXCLUDEUPDATE = 0x100;
+        public const int DCX_INTERSECTUPDATE = 0x200;
+        public const int DCX_LOCKWINDOWUPDATE = 0x400;
+        public const int DCX_VALIDATE = 0x200000;
+
+        public const int WM_THEMECHANGED = 0x031A;
+        public const int WM_NCPAINT = 0x85;
+        public const int WM_NCCALCSIZE = 0x83;
+
+        public const int WS_BORDER = 0x800000;
+        public const int WS_EX_CLIENTEDGE = 0x200;
+
+        public const int WVR_HREDRAW = 0x100;
+        public const int WVR_VREDRAW = 0x200;
+        public const int WVR_REDRAW = (WVR_HREDRAW | WVR_VREDRAW);
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct NCCALCSIZE_PARAMS
+        {
+            public RECT rgrc0, rgrc1, rgrc2;
+            public IntPtr lppos;
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct RECT
+        {
+            public int Left;
+            public int Top;
+            public int Right;
+            public int Bottom;
+
+            public static RECT FromRectangle(Rectangle rectangle)
+            {
+                RECT result = new RECT();
+                result.Left = rectangle.Left;
+                result.Top = rectangle.Top;
+                result.Right = rectangle.Right;
+                result.Bottom = rectangle.Bottom;
+                return result;
+            }
+
+            public Rectangle ToRectangle()
+            {
+                return new Rectangle(Left, Top, Right - Left, Bottom - Top);
+            }
+        }
+
+        [DllImport("user32.dll", SetLastError = true)]
+        public static extern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, int flags);
+
+        [DllImport("user32.dll")]
+        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
+
+        [DllImport("user32.dll")]
+        public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
+    }
+}