gtk/gtk.go
func (v *Notebook) AppendPageMenu(child IWidget, tabLabel IWidget, menuLabel IWidget) int {
	c := C.gtk_notebook_append_page_menu(v.native(), child.toWidget(),
		tabLabel.toWidget(), menuLabel.toWidget())
	return int(c)
}
func (v *Notebook) AppendPageMenu(child IWidget, tabLabel IWidget, menuLabel IWidget) int {
	c := C.gtk_notebook_append_page_menu(v.native(), child.toWidget(),
		tabLabel.toWidget(), menuLabel.toWidget())
	return int(c)
}
// AppendPageMenu() is a wrapper around gtk_notebook_append_page_menu().