gtk/tooltip.go
func (t *Tooltip) SetIcon(pixbuf *gdk.Pixbuf) {
	C.gtk_tooltip_set_icon(t.native(),
		(*C.GdkPixbuf)(unsafe.Pointer(pixbuf.Native())))
}
func (t *Tooltip) SetIcon(pixbuf *gdk.Pixbuf) {
	C.gtk_tooltip_set_icon(t.native(),
		(*C.GdkPixbuf)(unsafe.Pointer(pixbuf.Native())))
}
// SetIcon is a wrapper around gtk_tooltip_set_icon().