GTK+ GtkDialog

книгу читаю Foundation of GTK+ Developmentнаписаноtypedef struct{ GtkWidget *vbox; GtkWidget *action_area;} GtkDialog;Юзаю39 gtk_box_pack_start_defaults (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox);пишет gccgcc dialog.c -o dialog `pkg-config --cflags --libs gtk+-2.0`dialog.c: In function button_clicked:dialog.c:39: error: GtkWidget has no member named vbox