ElggMenuItem::setParent PHP Method

    public function setParent($parent)
    {
        $this->data['parent'] = $parent;
    }

<?php

$params = array();
$params['menu'] = array();
$params['menu']['default'] = array();
for ($i = 1; $i <= 5; $i++) {
    $params['menu']['default'][] = new ElggMenuItem($i, "Page {$i}", "#");
    $params['menu']['alt'][] = new ElggMenuItem($i, "Page {$i}", "#");
}
$params['menu']['default'][2]->setSelected(true);
$m = new ElggMenuItem(10, "Child", "{$url}#");
$m->setParent($params['menu']['default'][1]);
$params['menu']['default'][1]->addChild($m);
?>

<div class="elgg-sidebar">
<?php 
echo elgg_view('navigation/menu/page', $params);
?>
</div>