Piwik\Menu\MenuAdmin::addDevelopmentItem PHP Method

    public function addDevelopmentItem($menuName, $url, $order = 50, $tooltip = false)
    {
        if (Development::isEnabled()) {
            $this->addItem('CoreAdminHome_MenuDevelopment', $menuName, $url, $order, $tooltip);
        }
    }

 public function configureAdminMenu(MenuAdmin $menu)
 {
     $menu->registerMenuIcon('CoreAdminHome_MenuDevelopment', 'icon-admin-development');
     $menu->registerMenuIcon('CoreAdminHome_MenuDiagnostic', 'icon-admin-diagnostic');
     $menu->registerMenuIcon('CorePluginsAdmin_MenuPlatform', 'icon-admin-platform');
     $menu->registerMenuIcon('General_Settings', 'icon-admin-settings');
     $menu->registerMenuIcon('CoreAdminHome_Administration', 'icon-admin-administration');
     if (Development::isEnabled() && Piwik::isUserHasSomeAdminAccess()) {
         $menu->addDevelopmentItem('UI Demo', $this->urlForAction('demo'));
     }
 }