#define E_CANVAS_VBOX_TYPE struct ECanvasVbox; void e_canvas_vbox_add_item (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item);
GtkObject +----GnomeCanvasItem +----GnomeCanvasGroup +----ECanvasVbox
#define E_CANVAS_VBOX_TYPE (e_canvas_vbox_get_type ())
struct ECanvasVbox;
void e_canvas_vbox_add_item (ECanvasVbox *e_canvas_vbox, GnomeCanvasItem *item);