gtk/gtk.go
func (v *Notebook) InsertPage(child IWidget, tabLabel IWidget, position int) int {
	label := nullableWidget(tabLabel)
	c := C.gtk_notebook_insert_page(v.native(), child.toWidget(), label, C.gint(position))

	return int(c)
}
func (v *Notebook) InsertPage(child IWidget, tabLabel IWidget, position int) int {
	label := nullableWidget(tabLabel)
	c := C.gtk_notebook_insert_page(v.native(), child.toWidget(), label, C.gint(position))

	return int(c)
}
// InsertPage() is a wrapper around gtk_notebook_insert_page().