Index: /CKEditor/trunk/_source/plugins/about/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/about/plugin.js	(revision 3457)
+++ /CKEditor/trunk/_source/plugins/about/plugin.js	(revision 3458)
@@ -8,5 +8,7 @@
 	init : function( editor )
 	{
-		editor.addCommand( 'about', new CKEDITOR.dialogCommand( 'about' ) );
+		var command = editor.addCommand( 'about', new CKEDITOR.dialogCommand( 'about' ) );
+		command.modes = { wysiwyg:1, source:1 };
+
 		editor.ui.addButton( 'About',
 			{
@@ -14,4 +16,5 @@
 				command : 'about'
 			});
+
 		CKEDITOR.dialog.add( 'about', this.path + 'dialogs/about.js' );
 	}