void gtk_container_forall ( GtkContainer* container, GtkCallback callback, gpointer callback_data )
callback on each direct child of
children that are considered “internal” (implementation details
of the container). “Internal” children generally weren’t added
by the user of the container, but were added by the container
Most applications should use gtk_container_foreach(), rather than gtk_container_forall().
Callback user data.
The argument can be
The data is owned by the caller of the method.