addButton
Adds a button with the given text.
GTK arranges things so that clicking the button will emit the signal@Gtk.Dialog::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.
Return
the GtkButton widget that was added
Parameters
buttonText
text of button
responseId
response ID for the button