Index: /CKEditor/trunk/_source/core/editor.js
===================================================================
--- /CKEditor/trunk/_source/core/editor.js	(revision 3266)
+++ /CKEditor/trunk/_source/core/editor.js	(revision 3267)
@@ -75,7 +75,21 @@
 		editor.on( 'customConfigLoaded', function()
 			{
-				// Overwrite the settings from the in-page config.
 				if ( instanceConfig )
+				{
+					// Register the events that may have been set at the instance
+					// configuration object.
+					if ( instanceConfig.on )
+					{
+						for ( var eventName in instanceConfig.on )
+						{
+							editor.on( eventName, instanceConfig.on[ eventName ] );
+						}
+					}
+
+					// Overwrite the settings from the in-page config.
 					CKEDITOR.tools.extend( editor.config, instanceConfig, true );
+
+					delete editor.config.on;
+				}
 
 				onConfigLoaded( editor );