diff --git a/Source/Examples/Tutorial/T03_RotatingCube.cs b/Source/Examples/Tutorial/T03_RotatingCube.cs
index 60b5dcd6..e8129721 100644
--- a/Source/Examples/Tutorial/T03_RotatingCube.cs
+++ b/Source/Examples/Tutorial/T03_RotatingCube.cs
@@ -90,7 +90,7 @@ namespace Examples.Tutorial
             if ((Keyboard[0][OpenTK.Input.Keys.LeftAlt] || Keyboard[0][OpenTK.Input.Keys.RightAlt]) &&
                 Keyboard[0][OpenTK.Input.Keys.Enter])
             {
-                Fullscreen = true;
+                Fullscreen = !Fullscreen;
             }
 
             GL.MatrixMode(Enums.MatrixMode.MODELVIEW);
diff --git a/Source/OpenTK/GLControl.cs b/Source/OpenTK/GLControl.cs
index af215f59..caf65575 100644
--- a/Source/OpenTK/GLControl.cs
+++ b/Source/OpenTK/GLControl.cs
@@ -84,8 +84,7 @@ namespace OpenTK
             if (height > 0)
                 this.Height = height;
             */
-            if (mode.Fullscreen)
-                this.Fullscreen = true;
+            this.Fullscreen = mode.Fullscreen;
             
             this.SetStyle(ControlStyles.UserPaint, true);
             this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
@@ -135,11 +134,12 @@ namespace OpenTK
         {
             get
             {
-                throw new NotImplementedException();
+                return false;
+                //throw new NotImplementedException();
             }
             set
             {
-                throw new NotImplementedException();
+                //throw new NotImplementedException();
             }
         }
 
diff --git a/Source/OpenTK/Platform/Windows/WinGLControl.cs b/Source/OpenTK/Platform/Windows/WinGLControl.cs
index 6f43541c..4a44162c 100644
--- a/Source/OpenTK/Platform/Windows/WinGLControl.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLControl.cs
@@ -71,7 +71,8 @@ namespace OpenTK.Platform.Windows
             }
             set
             {
-                throw new NotImplementedException();
+                fullscreen = false;
+                //throw new NotImplementedException();
             }
         }
 
diff --git a/Source/OpenTK/Platform/Windows/WinGLNative.cs b/Source/OpenTK/Platform/Windows/WinGLNative.cs
index c65a0d27..dc20cfac 100644
--- a/Source/OpenTK/Platform/Windows/WinGLNative.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLNative.cs
@@ -317,10 +317,12 @@ namespace OpenTK.Platform.Windows
         {
             get
             {
-                throw new NotImplementedException();
+                return false;
+                //throw new NotImplementedException();
             }
             set
             {
+                fullscreen = false;
                 throw new NotImplementedException();
             }
         }
diff --git a/Source/OpenTK/Platform/X11/X11GLControl.cs b/Source/OpenTK/Platform/X11/X11GLControl.cs
index 2361f464..0a2a8ce9 100644
--- a/Source/OpenTK/Platform/X11/X11GLControl.cs
+++ b/Source/OpenTK/Platform/X11/X11GLControl.cs
@@ -158,7 +158,8 @@ namespace OpenTK.Platform.X11
             }
             set
             {
-                throw new Exception("The method or operation is not implemented.");
+                //throw new Exception("The method or operation is not implemented.");
+                fullscreen = false;
             }
         }
 
diff --git a/Source/OpenTK/Platform/X11/X11GLNative.cs b/Source/OpenTK/Platform/X11/X11GLNative.cs
index ef480aaf..d6d63b06 100644
--- a/Source/OpenTK/Platform/X11/X11GLNative.cs
+++ b/Source/OpenTK/Platform/X11/X11GLNative.cs
@@ -334,11 +334,13 @@ namespace OpenTK.Platform.X11
         {
             get
             {
-                throw new Exception("The method or operation is not implemented.");
+                return false;
+                //throw new Exception("The method or operation is not implemented.");
             }
             set
             {
-                throw new Exception("The method or operation is not implemented.");
+                
+                //throw new Exception("The method or operation is not implemented.");
             }
         }