Index: Collection.php
===================================================================
--- Collection.php	(revision 7696)
+++ Collection.php	(working copy)
@@ -1054,13 +1054,14 @@
      * checks if one of the containing records is modified 
      * returns true if modified, false otherwise 
      *  
+     * @param boolean $deep     whether to process also the relations for changes
      * @return boolean  
      */ 
-    final public function isModified() { 
+    final public function isModified($deep = false) { 
         $dirty = (count($this->getInsertDiff()) > 0 || count($this->getDeleteDiff()) > 0); 
         if ( ! $dirty) {  
             foreach($this as $record) { 
-                if ($dirty = $record->isModified()) {
+                if ($dirty = $record->isModified($deep)) {
                     break;
                 } 
             }