gtk-dialog-add-action-widget (dialog child response)

dialog -- a gtk-dialog widget
child -- an activatable gtk-widget widget
response -- response ID for child, which is a positive integer or a value of the gtk-response-type enumeration

Adds an activatable child widget to the action area of the dialog, connecting a signal handler that will emit the "response" signal on the dialog when the child widget is activated. The child widget is appended to the end of the action area of the dialog. If you want to add a non-activatable widget, simply pack it into the action area of the dialog.