Adds a button with the given text 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 info bars's
action area. The button widget is returned, but usually you don't
need it.
Since 2.18
Adds a button with the given text 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 info bars's action area. The button widget is returned, but usually you don't need it. Since 2.18