Trigger sonata-admin-append-form-element event on collection form type

Resources/public/base.js

@@ -170,7 +170,10 @@ var Admin = {
             var parts = container.attr('id').split('_');
             var nameRegexp = new RegExp(parts[parts.length-1]+'\\]\\['+protoName,'g');
             proto = proto.replace(nameRegexp, parts[parts.length-1]+']['+(container.children().length - 1));
-            jQuery(proto).insertBefore(jQuery(this).parent());
+            jQuery(proto)
+                .insertBefore(jQuery(this).parent())
+                .trigger('sonata-admin-append-form-element')
+            ;
 
             jQuery(this).trigger('sonata-collection-item-added');
         });