diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..1c0027f
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,17 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# use tabs by default for everything
+[*.cs]
+indent_style = tab
+indent_size = 4
+tab_size = 4
+charset=utf-8
+csharp_new_line_before_open_brace = all
+
+[*.{csproj,vbproj,proj,targets,props}]
+indent_style = space
+indent_size = 2
+tab_size = 2
diff --git a/Eto.OpenTK.Mac/MacGLSurfaceHandler.cs b/Eto.OpenTK.Mac/MacGLSurfaceHandler.cs
index 5e8d9ab..535a65e 100644
--- a/Eto.OpenTK.Mac/MacGLSurfaceHandler.cs
+++ b/Eto.OpenTK.Mac/MacGLSurfaceHandler.cs
@@ -18,14 +18,14 @@
 namespace Eto.OpenTK.Mac
 {
 
-    public class MacGLSurfaceHandler : MacView<MacGLView8, GLSurface, GLSurface.ICallback>, GLSurface.IHandler
+	public class MacGLSurfaceHandler : MacView<MacGLView8, GLSurface, GLSurface.ICallback>, GLSurface.IHandler
 	{
 		static MacGLSurfaceHandler()
 		{
 			Toolkit.Init(new ToolkitOptions
 			{
 				Backend = PlatformBackend.PreferNative // prevent SDL2 from being detected if it is installed.
-			});
+			});
 		}
 
 		protected override void Initialize()
@@ -77,7 +77,7 @@ public override void Invalidate(bool invalidateChildren)
 
 		public override void Invalidate(Rectangle rect, bool invalidateChildren)
 		{
-			Control.NeedsNewContext = true;
+			Control.NeedsNewContext = true;
 			base.Invalidate(rect, invalidateChildren);
 			var needsDisplayInRect = rect.ToNS();
 			if (!Control.IsFlipped)
@@ -101,7 +101,11 @@ public override void AttachEvent(string id)
 					break;
 
 				case Eto.Forms.Control.SizeChangedEvent:
-					Control.SizeChanged += (sender, e) => Callback.OnSizeChanged(Widget, EventArgs.Empty);
+					Control.SizeChanged += (sender, e) =>
+					{
+						OnSizeChanged(EventArgs.Empty);
+						Callback.OnSizeChanged(Widget, EventArgs.Empty);
+					};
 					break;
 
 				default: