diff --git a/Source/Examples/OpenGL/1.x/FramebufferObject.cs b/Source/Examples/OpenGL/1.x/FramebufferObject.cs
index 00b50762..c4bd9f2b 100644
--- a/Source/Examples/OpenGL/1.x/FramebufferObject.cs
+++ b/Source/Examples/OpenGL/1.x/FramebufferObject.cs
@@ -33,12 +33,12 @@ namespace Examples.Tutorial
 
         protected override void OnLoad(EventArgs e)
         {
-            if (!GL.GetString(StringName.Extensions).Contains("EXT_framebuffer_object"))
+            base.OnLoad(e);
+
+            if (!GL.GetString(StringName.Extensions).Contains("GL_EXT_framebuffer_object"))
             {
-                System.Windows.Forms.MessageBox.Show(
-                     "Your video card does not support Framebuffer Objects. Please update your drivers.",
-                     "FBOs not supported",
-                     System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Exclamation);
+                throw new NotSupportedException(
+                     "GL_EXT_framebuffer_object extension is required. Please update your drivers.");
                 Exit();
             }
 
diff --git a/Source/Examples/OpenGL/1.x/TextureMatrix.cs b/Source/Examples/OpenGL/1.x/TextureMatrix.cs
index 464c305c..749b4318 100644
--- a/Source/Examples/OpenGL/1.x/TextureMatrix.cs
+++ b/Source/Examples/OpenGL/1.x/TextureMatrix.cs
@@ -123,8 +123,9 @@ namespace Examples.Tutorial
             GL.GenTextures(1, out texture);
             GL.BindTexture(Target, texture);
 
-            float version = Single.Parse(GL.GetString(StringName.Version).Substring(0, 3), System.Globalization.CultureInfo.InvariantCulture);
-            if (version >= 1.4)
+            Version version = new Version(GL.GetString(StringName.Version).Substring(0, 3));
+            Version target = new Version(1, 4);
+            if (version >= target)
             {
                 GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.GenerateMipmap, (int)All.True);
                 GL.TexParameter(Target, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
diff --git a/Source/Examples/OpenGL/1.x/VBODynamic.cs b/Source/Examples/OpenGL/1.x/VBODynamic.cs
index 45e8f320..9e5752e0 100644
--- a/Source/Examples/OpenGL/1.x/VBODynamic.cs
+++ b/Source/Examples/OpenGL/1.x/VBODynamic.cs
@@ -52,6 +52,16 @@ namespace Examples.Tutorial
         /// <param name="e">Not used.</param>
         protected override void OnLoad(EventArgs e)
         {
+            base.OnLoad(e);
+
+            Version version = new Version(GL.GetString(StringName.Version).Substring(0, 3));
+            Version target = new Version(1, 5);
+            if (version < target)
+            {
+                throw new NotSupportedException(String.Format(
+                    "OpenGL {0} is required (you only have {1}).", target, version));
+            }
+
             GL.ClearColor(.1f, 0f, .1f, 0f);
             GL.Enable(EnableCap.DepthTest);
 
diff --git a/Source/Examples/OpenGL/1.x/VBOStatic.cs b/Source/Examples/OpenGL/1.x/VBOStatic.cs
index 4bf3bdff..4e378177 100644
--- a/Source/Examples/OpenGL/1.x/VBOStatic.cs
+++ b/Source/Examples/OpenGL/1.x/VBOStatic.cs
@@ -57,14 +57,12 @@ namespace Examples.Tutorial
         {
             base.OnLoad(e);
 
-            string version = GL.GetString(StringName.Version);
-            int major = (int)version[0];
-            int minor = (int)version[2];
-            if (major <= 1 && minor < 5)
+            Version version = new Version(GL.GetString(StringName.Version).Substring(0, 3));
+            Version target = new Version(1, 5);
+            if (version < target)
             {
-                System.Windows.Forms.MessageBox.Show("You need at least OpenGL 1.5 to run this example. Aborting.", "VBOs not supported",
-                    System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Exclamation);
-                this.Exit();
+                throw new NotSupportedException(String.Format(
+                    "OpenGL {0} is required (you only have {1}).", target, version));
             }
 
             GL.ClearColor(System.Drawing.Color.MidnightBlue);
diff --git a/Source/Examples/OpenGL/2.x/JuliaSetFractal.cs b/Source/Examples/OpenGL/2.x/JuliaSetFractal.cs
index b63c5ca3..57ea5e7c 100644
--- a/Source/Examples/OpenGL/2.x/JuliaSetFractal.cs
+++ b/Source/Examples/OpenGL/2.x/JuliaSetFractal.cs
@@ -59,15 +59,15 @@ namespace Examples.Tutorial
         /// <param name="e">Not used.</param>
         protected override void OnLoad(EventArgs e)
         {
+            base.OnLoad(e);
+
             // Check for necessary capabilities:
-            string version = GL.GetString(StringName.Version);
-            int major = (int)version[0];
-            int minor = (int)version[2];
-            if (major < 2)
+            Version version = new Version(GL.GetString(StringName.Version).Substring(0, 3));
+            Version target = new Version(2, 0);
+            if (version < target)
             {
-                MessageBox.Show("You need at least OpenGL 2.0 to run this example. Aborting.",
-                                 "GLSL not supported", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
-                this.Exit();
+                throw new NotSupportedException(String.Format(
+                    "OpenGL {0} is required (you only have {1}).", target, version));
             }
 
             this.VSync = VSyncMode.On;
diff --git a/Source/Examples/OpenGL/2.x/SimpleGLSL.cs b/Source/Examples/OpenGL/2.x/SimpleGLSL.cs
index da7d06fd..d0e37fe6 100644
--- a/Source/Examples/OpenGL/2.x/SimpleGLSL.cs
+++ b/Source/Examples/OpenGL/2.x/SimpleGLSL.cs
@@ -56,15 +56,15 @@ namespace Examples.Tutorial
         /// <param name="e">Not used.</param>
         protected override void OnLoad(EventArgs e)
         {
+            base.OnLoad(e);
+            
             // Check for necessary capabilities:
-            string version = GL.GetString(StringName.Version);
-            int major = (int)version[0];
-            int minor = (int)version[2];
-            if (major < 2)
+            Version version = new Version(GL.GetString(StringName.Version).Substring(0, 3));
+            Version target = new Version(2, 0);
+            if (version < target)
             {
-                MessageBox.Show("You need at least OpenGL 2.0 to run this example. Aborting.", "GLSL not supported",
-                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
-                this.Exit();
+                throw new NotSupportedException(String.Format(
+                    "OpenGL {0} is required (you only have {1}).", target, version));
             }
 
             GL.ClearColor(Color.MidnightBlue);
diff --git a/Source/Examples/OpenTK/Test/Extensions.cs b/Source/Examples/OpenTK/Test/Extensions.cs
index a9ad6aea..b6f4c2c7 100644
--- a/Source/Examples/OpenTK/Test/Extensions.cs
+++ b/Source/Examples/OpenTK/Test/Extensions.cs
@@ -21,7 +21,7 @@ using System.Text.RegularExpressions;
 
 namespace Examples.WinForms
 {
-    [Example("OpenGL Extensions", ExampleCategory.OpenTK, "Test", Documentation="Extensions")]
+    [Example("OpenGL Extensions", ExampleCategory.OpenTK, "Test", Documentation="Extensions", Visible = false)]
     public partial class Extensions : Form
     {
         #region Fields