gtk/gtk.go
func (v *TreeModel) IterNChildren(iter *TreeIter) int {
	var cIter *C.GtkTreeIter
	if iter != nil {
		cIter = iter.native()
	}
	c := C.gtk_tree_model_iter_n_children(v.native(), cIter)
	return int(c)
}
func (v *TreeModel) IterNChildren(iter *TreeIter) int {
	var cIter *C.GtkTreeIter
	if iter != nil {
		cIter = iter.native()
	}
	c := C.gtk_tree_model_iter_n_children(v.native(), cIter)
	return int(c)
}
// IterNChildren is a wrapper around gtk_tree_model_iter_n_children().