GtkWindow::set_default
set_default() sets the child
widget passed to it as the default child. (This will usually be a
GtkButton.) The child must have the flag
GTK_CAN_DEFAULT set in order to be allowed
focus. Some widgets are created with this flag already set;
GtkButton is not one of those widgets, and needs
to be flagged.
Child widgets that are set as default are marked as such in a way that
will be familiar to users. For instance, a button set as default has a
decorative frame and shadow around it.
See also: GtkWidgetFlags,
GtkWidget,
set_flags() .
