RefPtr<Action> act = myactions.find_action ("StepEditing/toggle-triplet");
RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic (act);
RefPtr<Action> act = myactions.find_action ("StepEditing/toggle-triplet");
RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic (act);