code: func PanedNew(orientation Orientation) (*Paned, error) {
  	c := C.gtk_paned_new(C.GtkOrientation(orientation))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapPaned(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // PanedNew() is a wrapper around gtk_paned_new().