Minor style fix

flask_admin/contrib/mongoengine/fields.py

@@ -4,7 +4,7 @@ from wtforms import fields
 from wtforms.fields.core import _unset_value
 
 from . import widgets
-from flask.ext.admin.model.widgets import InlineFormWidget
+from flask.ext.admin.model.fields import InlineFormField
 
 
 def is_empty(file_object):
@@ -14,12 +14,10 @@ def is_empty(file_object):
     return not bool(first_char)
 
 
-class ModelFormField(fields.FormField):
+class ModelFormField(InlineFormField):
     """
         Customized ModelFormField for MongoEngine EmbeddedDocuments.
     """
-    widget = InlineFormWidget()
-
     def __init__(self, model, view, form_class, form_opts=None, **kwargs):
         super(ModelFormField, self).__init__(form_class, **kwargs)