Index: /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js	(revision 5068)
+++ /CKEditor/branches/features/aria/_source/plugins/dialog/plugin.js	(revision 5069)
@@ -413,5 +413,6 @@
 		this.on( 'show', function()
 			{
-				if( editor.config.dialog_startupFocusTab )
+				if( editor.config.dialog_startupFocusTab
+					&& me._.tabIdList.length > 1 )
 				{
 					me._.tabBarMode = true;