$GLOBALS['TL_HOOKS']['backboneit_navigation_menu'][] = array('MyNavigationHook', 'hook');

class MyNavigationHook {
 
  // ... singleton dummy code ...
 
  public function hook($objThis, $arrRoots) {
    $intParentID = 1; // the ID of the parent node, were your new node should be appended/inserted to.
 
    if(!isset($objThis->arrItems[$intParentID])) // test if the parent should be rendered (to avoid my hook, if it is not needed)
      return;
 
    $strMyNewNodeID = 'MyNavigationHook' . 1; // to avoid collision do not use plain numbers (reservered for tl_page dataset IDs)
    // and prefix the ID with something specific to your hook
 
    $objThis->varActiveID = $strMyNewNodeID; // set my new node as active navigation item
 
    $objThis->arrSubpages[$intParentID][] = $strMyNewNodeID; // append the my new node to the end of $intParentIDs childs
    $arrRoots[] = $strMyNewNodeID; // additionally add my new node to the end of the first level
 
    $objThis->arrItems[$strMyNewNodeID] = array(
      'class' => 'myclass',
      'isTrail' => true, // whether this node is in the trail path of the active page
      // ... more rendering information for the navigation template (see class AbstractNavigationMenu for all fields) ...
    );
 
    return $arrRoots; // return the modified first navigation level (not needed if unmodified)
  }
 
}

<?php
 
/**
 * Helperclass to insert navigation-items
 * @author psi
 */
class Brands_BackboneNavi extends Controller
{
 
	public function hook($objNav, $arrRoots)
	{
		$this->import('Database');
 
		// Eine contao-seite enthält ein modul mit "virtuellen" unterseiten
		// Bsp: http://example.com/module-page/item1.html
		// Bsp2: http://example.com/module-page/item1/subitem1.html
		// herrausschneiden von "item1"
		if(!preg_match("~^".preg_quote($GLOBALS['objPage']->alias,'~')."/([a-z0-9_-]+).*\.html$~i",$this->Environment->request,$erg)) return;
 
		// level_1 Eintrag anhand von "item1" einfügen
		$objDesigner = $this->Database->prepare('SELECT id,title,alias FROM tl_brand WHERE alias=? AND published=?')->execute($erg[1],'1');
		if(!$objDesigner->numRows) return;
 
		// Seite in den Navigations-Pool hinzufügen
		$objNav->arrItems[$objDesigner->alias.'-'.$objDesigner->id] = array
		(
			'link'	=> $objDesigner->title,
			'href'  => $this->generateFrontendUrl($GLOBALS['objPage']->row(),'/'.$objDesigner->alias),
			// 'isTrail' => (preg_match("~".preg_quote($objDesigner->alias,'~')."\.html$~i",$this->Environment->request))
			'isTrail' => true // wir zeigen ohnehin immer nur einen Eintrag des level_1 an, deshalb immer true
		);	
 
		// als Unterseite von level_0 zuweisen 
		$objNav->arrSubpages[$GLOBALS['objPage']->id][] = $objDesigner->alias.'-'.$objDesigner->id;
 
 
		// level_2 Einträge einfügen
		$objCats = $this->Database->prepare('SELECT category,categoryAlias FROM tl_brand_product WHERE pid=? AND published=? GROUP BY category')->execute($objDesigner->id,'1');
		while($objCats->next())
		{
			// Seite in den Navigations-Pool hinzufügen
			$objNav->arrItems[$objDesigner->id.'-'.$objCats->categoryAlias] = array
			(
				'link'	=> $objCats->category,
				'href'  => $this->generateFrontendUrl($GLOBALS['objPage']->row(),'/'.$objDesigner->alias.'/'.$objCats->categoryAlias),
				'isTrail' => (preg_match("~".preg_quote($objCats->categoryAlias,'~')."(/.+|.html)$~i",$this->Environment->request)) 
			);	
			// Seite als Unterseite des level_1 Eitnrags zuweisen
			$objNav->arrSubpages[$objDesigner->alias.'-'.$objDesigner->id][] = $objDesigner->id.'-'.$objCats->categoryAlias;
		} 
 
		return $arrRoots;
	}
}
?>