diff --git a/Source/GLControl/CarbonGLControl.cs b/Source/GLControl/CarbonGLControl.cs
index 22dfef8e..40cebef5 100644
--- a/Source/GLControl/CarbonGLControl.cs
+++ b/Source/GLControl/CarbonGLControl.cs
@@ -46,7 +46,24 @@ namespace OpenTK
             this.mode = mode;
             this.control = owner;
 
-            window_info = Utilities.CreateMacOSCarbonWindowInfo(control.Handle, false, true);
+            window_info = Utilities.CreateMacOSCarbonWindowInfo(control.Handle, false, true, GetXOffset, GetYOffset);
+        }
+
+        private int GetXOffset()
+        {
+            return control.Location.X;
+        }
+
+        private int GetYOffset()
+        {
+            if (control.TopLevelControl != null) 
+            {
+                System.Drawing.Point offset = control.PointToScreen (control.Location);
+                System.Drawing.Point windowOffset = control.TopLevelControl.PointToScreen (System.Drawing.Point.Empty);
+                int relativeY = offset.Y - windowOffset.Y; //control.TopLevelControl.Location.Y is not the same as windowOffset.Y for some reason.
+                return control.TopLevelControl.ClientSize.Height - control.Bottom - relativeY;
+            }
+            return control.Location.Y;
         }
 
         #region IGLControl Members
diff --git a/Source/GLControl/GLControl.cs b/Source/GLControl/GLControl.cs
index c2f616f6..faba119d 100644
--- a/Source/GLControl/GLControl.cs
+++ b/Source/GLControl/GLControl.cs
@@ -270,12 +270,30 @@ namespace OpenTK
                 return;
             }
 
-            if (context != null)
-                context.Update(Implementation.WindowInfo);
+            if (Configuration.RunningOnMacOS) 
+            {
+                DelayUpdate delay = PerformContextUpdate;
+                BeginInvoke(delay); //Need the native window to resize first otherwise our control will be in the wrong place.
+            }
+            else if (context != null)
+                context.Update (Implementation.WindowInfo);
 
             base.OnResize(e);
         }
 
+        /// <summary>
+        /// Needed to delay the invoke on OS X. Also needed because OpenTK is .NET 2, otherwise I'd use an inline Action.
+        /// </summary>
+        public delegate void DelayUpdate();
+        /// <summary>
+        /// Execute the delayed context update
+        /// </summary>
+        public void PerformContextUpdate()
+        {
+            if (context != null)
+                context.Update (Implementation.WindowInfo);
+        }
+
         /// <summary>
         /// Raises the ParentChanged event.
         /// </summary>
diff --git a/Source/OpenTK/Platform/MacOS/AglContext.cs b/Source/OpenTK/Platform/MacOS/AglContext.cs
index f8e0fe0c..eab21a05 100644
--- a/Source/OpenTK/Platform/MacOS/AglContext.cs
+++ b/Source/OpenTK/Platform/MacOS/AglContext.cs
@@ -172,32 +172,20 @@ namespace OpenTK.Platform.MacOS
             if (carbonWindow.IsControl == false)
                 return;
 
-            // Todo: See if there is a way around using WinForms.
-            throw new NotImplementedException();
-#if false
-            System.Windows.Forms.Control ctrl = Control.FromHandle(carbonWindow.WindowRef);
-            
-            if (ctrl.TopLevelControl == null)
-                return;
-            
-            Rect rect = API.GetControlBounds(carbonWindow.WindowRef);
-            System.Windows.Forms.Form frm = (System.Windows.Forms.Form)ctrl.TopLevelControl;
-            
-            System.Drawing.Point loc = frm.PointToClient(ctrl.PointToScreen(System.Drawing.Point.Empty));
-            
-            rect.X = (short)loc.X;
-            rect.Y = (short)loc.Y;
+            Rect rect = API.GetControlBounds(carbonWindow.WindowHandle);
             
             Debug.Print("Setting buffer_rect for control.");
             Debug.Print("MacOS Coordinate Rect:   {0}", rect);
-            
-            rect.Y = (short)(ctrl.TopLevelControl.ClientSize.Height - rect.Y - rect.Height);
-            Debug.Print("  AGL Coordinate Rect:   {0}", rect);
-            
             int[] glrect = new int[4];
-            
-            glrect[0] = rect.X;
-            glrect[1] = rect.Y;
+
+            if (carbonWindow.XOffset != null)
+                glrect[0] = rect.X + carbonWindow.XOffset();
+            else
+                glrect[0] = rect.X;
+            if (carbonWindow.YOffset != null)
+                glrect[1] = rect.Y + carbonWindow.YOffset();
+            else
+                glrect[1] = rect.Y;
             glrect[2] = rect.Width;
             glrect[3] = rect.Height;
             
@@ -206,7 +194,6 @@ namespace OpenTK.Platform.MacOS
             
             Agl.aglEnable(Handle.Handle, Agl.ParameterNames.AGL_BUFFER_RECT);
             MyAGLReportError("aglEnable");
-#endif
         }
         void SetDrawable(CarbonWindowInfo carbonWindow)
         {
diff --git a/Source/OpenTK/Platform/MacOS/CarbonWindowInfo.cs b/Source/OpenTK/Platform/MacOS/CarbonWindowInfo.cs
index 717a6c58..687857b2 100644
--- a/Source/OpenTK/Platform/MacOS/CarbonWindowInfo.cs
+++ b/Source/OpenTK/Platform/MacOS/CarbonWindowInfo.cs
@@ -32,6 +32,13 @@ using System.Text;
 
 namespace OpenTK.Platform.MacOS
 {
+    /// <summary>
+    /// This delegate represents any method that takes no arguments and returns an int.
+    /// I would have used Func but that requires .NET 4
+    /// </summary>
+    /// <returns>The int value that your method returns</returns>
+    public delegate int GetInt();
+
     /// \internal
     /// <summary>
     /// Describes a Carbon window.
@@ -45,6 +52,9 @@ namespace OpenTK.Platform.MacOS
         bool goFullScreenHack = false;
         bool goWindowedHack = false;
 
+        GetInt xOffset;
+        GetInt yOffset;
+
         #region Constructors
 
         /// <summary>
@@ -60,6 +70,12 @@ namespace OpenTK.Platform.MacOS
             this.isControl = isControl;
         }
 
+        public CarbonWindowInfo(IntPtr windowRef, bool ownHandle, bool isControl, GetInt getX, GetInt getY) : this(windowRef, ownHandle, isControl)
+        {
+            this.xOffset = getX;
+            this.yOffset = getY;
+        }
+
         #endregion
 
         #region Public Members
@@ -104,6 +120,16 @@ namespace OpenTK.Platform.MacOS
         // (e.g. MonoGame)
         public IntPtr WindowHandle { get { return Handle; } set { Handle = value; } }
 
+        public GetInt XOffset
+        {
+            get { return xOffset; }
+            set { xOffset = value; }
+        }
+        public GetInt YOffset
+        {
+            get { return yOffset; }
+            set { yOffset = value; }
+        }
         #endregion
 
         #region IDisposable Members
diff --git a/Source/OpenTK/Platform/Utilities.cs b/Source/OpenTK/Platform/Utilities.cs
index 82fa91ab..2de2dcea 100644
--- a/Source/OpenTK/Platform/Utilities.cs
+++ b/Source/OpenTK/Platform/Utilities.cs
@@ -273,7 +273,22 @@ namespace OpenTK.Platform
         /// <returns>A new IWindowInfo instance.</returns>
         public static IWindowInfo CreateMacOSCarbonWindowInfo(IntPtr windowHandle, bool ownHandle, bool isControl)
         {
-            return new OpenTK.Platform.MacOS.CarbonWindowInfo(windowHandle, false, isControl);
+            return CreateMacOSCarbonWindowInfo(windowHandle, ownHandle, isControl, null, null);
+        }
+
+        /// <summary>
+        /// Creates an IWindowInfo instance for the Mac OS X platform with an X and Y offset for the GL viewport location.
+        /// </summary>
+        /// <param name="windowHandle">The handle of the window.</param>
+        /// <param name="ownHandle">Ignored. This is reserved for future use.</param>
+        /// <param name="isControl">Set to true if windowHandle corresponds to a System.Windows.Forms control.</param>
+        /// <param name="xOffset">The X offset for the GL viewport</param>
+        /// <param name="yOffset">The Y offset for the GL viewport</param>
+        /// <returns>A new IWindowInfo instance.</returns>
+        public static IWindowInfo CreateMacOSCarbonWindowInfo(IntPtr windowHandle, bool ownHandle, bool isControl, 
+            OpenTK.Platform.MacOS.GetInt xOffset, OpenTK.Platform.MacOS.GetInt yOffset)
+        {
+            return new OpenTK.Platform.MacOS.CarbonWindowInfo(windowHandle, false, isControl, xOffset, yOffset);
         }
 
         #endregion