kettle endpoint with response attachments

i have defined a sparkl endpoint that return an excel file ( using add filename to result ) .
i have tested it from the sparkl console of the plugin and it works .
Then i have defined and action button component that call this endpoint .
I can see from developr tool that the ajax request return the excel binary stream .
However no dowload start .
Is there some way to call the endpoint to force the download ?

thanks for any answer