Index: CKEditor/trunk/CHANGES.html
===================================================================
--- CKEditor/trunk/CHANGES.html	(revision 4924)
+++ CKEditor/trunk/CHANGES.html	(revision 4940)
@@ -40,5 +40,5 @@
 		New features:</p>
 	<ul>
-		<li></li>
+		<li><a href="http://dev.fckeditor.net/ticket/4399">#4399</a> : Improved support for external file browsers by allowing to execute a callback function.</li>
 	</ul>
 	<p>
Index: CKEditor/trunk/_source/plugins/filebrowser/plugin.js
===================================================================
--- CKEditor/trunk/_source/plugins/filebrowser/plugin.js	(revision 4924)
+++ CKEditor/trunk/_source/plugins/filebrowser/plugin.js	(revision 4940)
@@ -360,4 +360,7 @@
 			dialog.getContentElement( targetInput[ 0 ], targetInput[ 1 ] ).reset();
 
+		if ( typeof data == 'function' && data.call( this._.filebrowserSe ) === false )
+			return;
+
 		if ( onSelect && onSelect.call( this._.filebrowserSe, fileUrl, data ) === false )
 			return;