Index: _source/plugins/wysiwygarea/plugin.js
===================================================================
--- _source/plugins/wysiwygarea/plugin.js	(revision 6044)
+++ _source/plugins/wysiwygarea/plugin.js	(revision )
@@ -621,14 +621,15 @@
 							} );
 						}
 
-						domWindow.on( 'blur', function()
+						var focusTarget = CKEDITOR.env.ie ? iframe : domWindow;
+						focusTarget.on( 'blur', function()
 							{
 								editor.focusManager.blur();
 							});
 
 						var wasFocused;
 
-						domWindow.on( 'focus', function()
+						focusTarget.on( 'focus', function()
 							{
 								var doc = editor.document;