Index: /CKEditor/trunk/_source/plugins/sourcearea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 3255)
+++ /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 3256)
@@ -145,4 +145,5 @@
 			exec : function( editor )
 			{
+				editor.getCommand( 'source' ).setState( CKEDITOR.TRISTATE_DISABLED );
 				editor.setMode( editor.mode == 'source' ? 'wysiwyg' : 'source' );
 			}