Index: _source/plugins/button/plugin.js
===================================================================
--- _source/plugins/button/plugin.js	(revision 7357)
+++ _source/plugins/button/plugin.js	(working copy)
@@ -89,6 +89,10 @@
 			},
 			execute : function()
 			{
+        // IE needs focus sent back to the parent document if a dialog is launched
+        if ( CKEDITOR.env.ie )
+          document.body.focus();
+
 				// IE 6 needs some time before execution (#7922)
 				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 7 )
 					CKEDITOR.tools.setTimeout( function(){ this.button.click( editor ); }, 0, this );