gtk/gtk.go
func (v *Toolbar) SetShowArrow(showArrow bool) {
	C.gtk_toolbar_set_show_arrow(v.native(), gbool(showArrow))
}
func (v *Toolbar) SetShowArrow(showArrow bool) {
	C.gtk_toolbar_set_show_arrow(v.native(), gbool(showArrow))
}
// SetShowArrow is a wrapper around gtk_toolbar_set_show_arrow().