fix the integration of the burgov/key-value-bundle

Author: dbu

app/config/config.yml

@@ -202,6 +202,9 @@ sonata_admin:
                     - cmf_simple_cms.persistence.phpcr.admin.page
 
 sonata_doctrine_phpcr_admin:
+    templates:
+        form:
+            - SandboxMainBundle:Admin:form_admin_fields.html.twig
     document_tree_defaults: [locale]
     document_tree:
         Doctrine\ODM\PHPCR\Document\Generic:

src/Sandbox/MainBundle/Resources/views/Admin/form_admin_fields.html.twig

@@ -0,0 +1,5 @@
+{% extends "SonataDoctrinePHPCRAdminBundle:Form:form_admin_fields.html.twig" %}
+
+{% block burgov_key_value_widget %}
+    {{- block('sonata_type_native_collection_widget') -}}
+{% endblock %}