diff --git a/weboob/capabilities/base.py b/weboob/capabilities/base.py
index 667fcb1c..15c678ce 100644
--- a/weboob/capabilities/base.py
+++ b/weboob/capabilities/base.py
@@ -62,7 +62,30 @@ class CapBaseObject(object):
         self.id = id
         self.backend = backend
 
+    def __iscomplete__(self):
+        """
+        Return True if the object is completed.
+
+        It is usefull when the object is a field of an other object which is
+        going to be filled.
+
+        The default behavior is to iter on fields (with iter_fields) and if
+        a field is NotLoaded, return False.
+        """
+        for key, value in self.iter_fields():
+            if value is NotLoaded:
+                return False
+        return True
+
     def iter_fields(self):
+        """
+        Iterate on the FIELDS keys and values.
+
+        Can be overloaded to iterate on other things.
+
+        @return [iter(key,value)]  iterator on key, value
+        """
+
         if self.FIELDS is None:
             for key, value in iter_fields(self):
                 if key != 'backend':
diff --git a/weboob/capabilities/contact.py b/weboob/capabilities/contact.py
index ebf0ee79..3a87c3c4 100644
--- a/weboob/capabilities/contact.py
+++ b/weboob/capabilities/contact.py
@@ -33,9 +33,10 @@ class ProfileNode(object):
         self.sufix = sufix
         self.flags = flags
 
-class ContactPhoto(object):
+class ContactPhoto(CapBaseObject):
     def __init__(self, name):
-        self.name = name
+        CapBaseObject.__init__(self, name)
+        self.name = name #useless, but keep compatibility
         self.url = u''
         self.data = ''
         self.thumbnail_url = u''
diff --git a/weboob/capabilities/video.py b/weboob/capabilities/video.py
index d6725b2a..94dfc74e 100644
--- a/weboob/capabilities/video.py
+++ b/weboob/capabilities/video.py
@@ -22,7 +22,7 @@ from .base import IBaseCap, NotLoaded, CapBaseObject
 __all__ = ['BaseVideo', 'ICapVideo']
 
 
-class VideoThumbnail(object):
+class VideoThumbnail(CapBaseObject):
     def __init__(self, url):
         self.url = url.replace(' ', '%20')
         self.data = NotLoaded
diff --git a/weboob/tools/backend.py b/weboob/tools/backend.py
index e8cab303..e0b96044 100644
--- a/weboob/tools/backend.py
+++ b/weboob/tools/backend.py
@@ -21,7 +21,7 @@ import os
 from threading import RLock
 from logging import debug
 
-from weboob.capabilities.base import IBaseCap, NotLoaded
+from weboob.capabilities.base import IBaseCap, NotLoaded, CapBaseObject
 
 
 __all__ = ['BaseBackend', 'ObjectNotAvailable']
@@ -193,6 +193,9 @@ class BaseBackend(object):
         return False
 
     def fillobj(self, obj, fields):
+        def not_loaded(v):
+            return (v is NotLoaded or isinstance(value, CapBaseObject) and not value.__iscomplete__())
+
         missing_fields = []
         for field in fields:
             if not hasattr(obj, field):
@@ -200,17 +203,12 @@ class BaseBackend(object):
             value = getattr(obj, field)
 
             missing = False
-            if isinstance(value, dict):
-                for v in value.itervalues():
-                    if hasattr(v, '__iscomplete__') and not v.__iscomplete__():
+            if hasattr(value, '__iter__'):
+                for v in (value.itervalues() if isinstance(value, dict) else value):
+                    if not_loaded(v):
                         missing = True
                         break
-            elif isinstance(value, (list,tuple)):
-                for v in value:
-                    if hasattr(v, '__iscomplete__') and not v.__iscomplete__():
-                        missing = True
-                        break
-            elif value is NotLoaded or hasattr(value, '__iscomplete__') and not value.__iscomplete__():
+            elif not_loaded(value):
                 missing = True
 
             if missing: