Index: /CKEditor/trunk/_source/plugins/filebrowser/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/filebrowser/plugin.js	(revision 7295)
+++ /CKEditor/trunk/_source/plugins/filebrowser/plugin.js	(revision 7296)
@@ -247,5 +247,5 @@
 			element = elements[ i ];
 
-			if ( element.type == 'hbox' || element.type == 'vbox' )
+			if ( element.type == 'hbox' || element.type == 'vbox' || element.type == 'fieldset' )
 				attachFileBrowser( editor, dialogName, definition, element.children );