Adds a button with the given text (or a stock button, if button_text is a
stock ID) and sets things up so that clicking the button will emit the
"response" signal with the given response_id. The button is
appended to the end of the dialog's action area. The button widget is
returned, but usually you don't need it.
Adds a button with the given text (or a stock button, if button_text is a stock ID) and sets things up so that clicking the button will emit the "response" signal with the given response_id. The button is appended to the end of the dialog's action area. The button widget is returned, but usually you don't need it.