You will need to override the _navigateBack method (that is called by the afterSave method) of the ProductSelectionSchema schema. This method publishes the "BackHistoryState" message via sandbox and is responsible for pushing the user back in the history.
i overrided the ProductSelectionSchema _navigateBack method.
i commented the line: this.sandbox.publish("BackHistoryState");
Now when i save the product in my orderproduct detail, i stay on the orderproduct selection page. how can i close the detail page to go back into the order ?