diff --git a/include/window.h b/include/window.h
index accd1e816..fb9190c4d 100755
--- a/include/window.h
+++ b/include/window.h
@@ -343,6 +343,9 @@ public:
   bool add_menu(TString_array& menu, MENU_TAG id = 0, bool force = TRUE);
   // @cmember Rimuove il menu' runtime dalla finestra
   bool remove_menu(MENU_TAG id);
+
+  // @cmember Chiamata ad ogni cambio ditta
+  virtual void on_firm_change() {}
 };
 
 // @doc INTERNAL