OnLoad/OnUnload should be protected, not public, to conform with the class library design guidelines. This issue was supposed to be fixed in 0.9.9-2, but was apparently overlooked.

Source/Examples/OpenGL/1.1/DisplayLists.cs

@@ -64,7 +64,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
             GL.Enable(EnableCap.DepthTest);

Source/Examples/OpenGL/1.1/ImmediateMode.cs

@@ -44,7 +44,7 @@ namespace Examples.Tutorial
 		
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
 

Source/Examples/OpenGL/1.1/Textures.cs

@@ -36,7 +36,7 @@ namespace Examples.Tutorial
         /// Setup OpenGL and load resources here.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
             GL.Enable(EnableCap.Texture2D);

Source/Examples/OpenGL/1.1/VertexArrays.cs

@@ -59,7 +59,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.Enable(EnableCap.Texture2D);
 

Source/Examples/OpenGL/1.1/VertexLighting.cs

@@ -34,7 +34,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
 

Source/Examples/OpenGL/1.5/VertexBufferObject.cs

@@ -46,7 +46,7 @@ namespace Examples.Tutorial
 
         #region OnLoad override
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
 

Source/Examples/OpenGL/3.0/HelloGL3.cs

@@ -120,7 +120,7 @@ void main(void)
             GraphicsContextFlags.ForwardCompatible | GraphicsContextFlags.Debug)
         { }
         
-        public override void OnLoad (System.EventArgs e)
+        protected override void OnLoad (System.EventArgs e)
         {
             // Create shaders
             vertexShaderHandle = GL.CreateShader(ShaderType.VertexShader);

Source/Examples/OpenGL/EXT/FramebufferObject.cs

@@ -52,7 +52,7 @@ namespace Examples.Tutorial
 
         #endregion Randoms
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             if (!GL.GetString(StringName.Extensions).Contains("EXT_framebuffer_object"))
             {

Source/Examples/OpenGL/EXT/GeometryShader.cs

@@ -46,7 +46,7 @@ namespace Examples.Tutorial
 
         int shaderProgram = 0;
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             if (!GL.GetString(StringName.Extensions).Contains("EXT_geometry_shader4"))
             {

Source/Examples/OpenGL/EXT/GeometryShaderAdvanced.cs

@@ -839,7 +839,7 @@ namespace Examples.Tutorial
 
         #region overrides
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             if (!GL.GetString(StringName.Extensions).Contains("EXT_geometry_shader4"))
             {

Source/Examples/OpenGL/GLSL/JuliaSetFractal.cs

@@ -63,7 +63,7 @@ namespace Examples.Tutorial
         /// Setup OpenGL and load resources here.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             // Check for necessary capabilities:
             string version = GL.GetString(StringName.Version);

Source/Examples/OpenGL/GLSL/SimpleGLSL.cs

@@ -58,7 +58,7 @@ namespace Examples.Tutorial
         /// check for GLSL support, and load the shaders.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             // Check for necessary capabilities:
             string version = GL.GetString(StringName.Version);

Source/Examples/OpenGLES/1.1/SimpleWindow.cs

@@ -61,7 +61,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
 

Source/Examples/OpenGLES/2.0/SimpleWindow20.cs

@@ -54,7 +54,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);
 

Source/Examples/OpenTK/Fonts/FontRenderingAdvanced.cs

@@ -42,7 +42,7 @@ namespace Examples.Tutorial
 
         #region OnLoad
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
 

Source/Examples/OpenTK/GameWindow/FullscreenAntialias.cs

@@ -83,7 +83,7 @@ namespace Examples
         /// Setup OpenGL and load resources here.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
         }

Source/Examples/OpenTK/GameWindow/SimpleWindow.cs

@@ -54,7 +54,7 @@ namespace Examples.Tutorial
         /// Setup OpenGL and load resources here.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
         }

Source/Examples/OpenTK/Test/GameWindowStates.cs

@@ -70,7 +70,7 @@ namespace Examples.Tests
             TextBitmap.UnlockBits(data);
         }
 
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             GL.ClearColor(Color.MidnightBlue);
 

Source/OpenTK/GameWindow.cs

@@ -293,7 +293,7 @@ namespace OpenTK
         /// Called after an OpenGL context has been established, but before entering the main loop.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public virtual void OnLoad(EventArgs e)
+        protected virtual void OnLoad(EventArgs e)
         {
             if (Load != null) Load(this, e);
         }
@@ -306,7 +306,7 @@ namespace OpenTK
         /// Called after GameWindow.Exit was called, but before destroying the OpenGL context.
         /// </summary>
         /// <param name="e">Not used.</param>
-        public virtual void OnUnload(EventArgs e)
+        protected virtual void OnUnload(EventArgs e)
         {
             if (Unload != null) Unload(this, e);
         }

Source/QuickStart/Game.cs

@@ -21,7 +21,7 @@ namespace StarterKit
 
         /// <summary>Load resources here.</summary>
         /// <param name="e">Not used.</param>
-        public override void OnLoad(EventArgs e)
+        protected override void OnLoad(EventArgs e)
         {
             base.OnLoad(e);