diff --git a/src/Symfony/Component/Form/Form.php b/src/Symfony/Component/Form/Form.php
index 0e68b88c01edf..9be9af1b353b4 100644
--- a/src/Symfony/Component/Form/Form.php
+++ b/src/Symfony/Component/Form/Form.php
@@ -1089,6 +1089,31 @@ private function clientToNorm($value)
         return $value;
     }
 
+    /**
+     * Helper function for use in BIND_CLIENT_DATA event.
+     * 
+     * @params string $name The name of the child field
+     * @params array $clientData the client data from the event
+     * 
+     * @return mixed
+     */
+    public function getChildNormData($name, $clientData)
+    {
+        if (!$this->hasChildren()) {
+            throw new \InvalidArgumentException('This form has no children');
+        }
+        
+        $form = $this->get($name);
+
+        $event = new DataEvent($form, $clientData[$name]);
+        $this->dispatcher->dispatch(FormEvents::PRE_BIND, $event);
+        
+        $event = new FilterDataEvent($form, $clientData[$name]);
+        $this->dispatcher->dispatch(FormEvents::BIND_CLIENT_DATA, $event);
+
+        return $form->clientToNorm($event->getData());
+    }
+
     /**
      * Validates whether the given variable is a valid form name.
      *
diff --git a/src/Symfony/Component/Form/Tests/FormTest.php b/src/Symfony/Component/Form/Tests/FormTest.php
index d6784f4e52393..4ce66af15552f 100644
--- a/src/Symfony/Component/Form/Tests/FormTest.php
+++ b/src/Symfony/Component/Form/Tests/FormTest.php
@@ -880,6 +880,21 @@ public function testBindMapsBoundChildrenOntoExistingClientData()
         ));
     }
 
+    public function testClientToApp()
+    {
+        $form = $this->getBuilder()->getForm();
+        
+        $form->add($this->getBuilder('test')
+            ->appendClientTransformer(new FixedDataTransformer(array(
+                '' => '',
+                'b' => 'a'
+            )))
+            ->getForm()
+        );
+
+        $this->assertEquals('b', $form->getChildNormData('test', array('test' => 'a')));
+    }
+
     public function testBindMapsBoundChildrenOntoEmptyData()
     {
         $test = $this;