diff --git a/trytond/protocols/dispatcher.py b/trytond/protocols/dispatcher.py
index 3b43041d1d..b2d1ecbe6b 100644
--- a/trytond/protocols/dispatcher.py
+++ b/trytond/protocols/dispatcher.py
@@ -109,6 +109,9 @@ def dispatch(host, port, protocol, database_name, user, session, object_type,
                 for object_name, obj in pool.iterobject(type=type):
                     for method in obj.__rpc__:
                         res.append(type + '.' + object_name + '.' + method)
+                    if hasattr(obj, '_buttons'):
+                        for button in obj._buttons:
+                            res.append(type + '.' + object_name + '.' + button)
             return res
         elif method == 'methodSignature':
             return 'signatures not supported'