Window.setDefault

The default widget is the widget that’s activated when the user presses Enter in a dialog (for example). This function sets or unsets the default widget for a #GtkWindow. When setting (rather than unsetting) the default widget it’s generally easier to call gtk.widget.Widget.grabDefault on the widget. Before making a widget the default widget, you must call gtk.widget.Widget.setCanDefault on the widget you’d like to make the default.