Index: /CKEditor/trunk/_source/plugins/button/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 3096)
+++ /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 3097)
@@ -35,4 +35,6 @@
 	 */
 	this.label = definition.label;
+	if ( CKEDITOR.env.ie )
+		this.label += '\ufeff';
 
 	/**