Joomla 1.5 - Virtuemart - How to show product and sub categories?

When i worked with Joomla 1.5 and Virtuemart, there is a common problem that if your shop is organized with 2 categories level, the parent category doesn't show products or sub categories; the result is "Categories is empty".

I have found 1 solution from internet. You can double check at this link or below:

In administrator/components/com_virtuemart/classes/ps_product_category.php

/*
 * Returns an array of the categories ids recursively for a given category
 * untreeCat copy lashae (virtuemart forum http://virtuemart.net/index.php?option=com_smf&Itemid=71&topic=20837.0)
 * @param int $kat
  * @param int $container
 * rewritten by haselnuss (to use ps_DB class and store the function in ps_product_category.php)
 */
 function untreeCat($kat, &$container) { 
  $db = new ps_DB;
  $q = "SELECT category_child_id FROM #__{vm}_category_xref WHERE category_parent_id='$kat'"; 
  $db->query($q);
  // if it is a leaf (no data underneath it) then return 
  if (!$db->num_rows()) { 
   return; 
  } 
  //else append the result, and recurse the function (so to speak) 
  else 
  { 
   while($db->next_record()) {
     $container[] = $db->f("category_child_id");
     $kat = $db->f("category_child_id");
     $this->untreeCat($kat, $container);
    }
  }
 }  

and in administrator/components/com_virtuemart/html/shop_browse_queries.php
About line 63 change:

// Filter Products by Category
if( $category_id ) {
 if( !empty( $search_this_category ) && (!empty( $keyword ) || !empty( $manufacturer_id ) )) {
  $where_clause[] = "`#__{vm}_product_category_xref`.`category_id`=".$category_id;
 } elseif( empty( $keyword ) && empty( $manufacturer_id )) {
  $where_clause[] = "`#__{vm}_product_category_xref`.`category_id`=".$category_id;
 }
}

to:

// Filter Products by Category
/*
 * Returns an array of the categories ids recursively for a given category
 * untreeCat copy lashae (virtuemart forum http://virtuemart.net/index.php?option=com_smf&Itemid=71&topic=20837.0)
 * rewritten by Creb (to use shop.browse page detection)
 */
if( $category_id ) {
 if( !empty( $search_this_category ) && (!empty( $keyword ) || !empty( $manufacturer_id ) )) {  
  $where_clause[] = "`#__{vm}_product_category_xref`.`category_id`=".$category_id; 
 } elseif( empty( $keyword ) && empty( $manufacturer_id )) {
 
 if ($_GET["page"]=="shop.browse") { 
     //$where_clause[] = "`#__{vm}_product_category_xref`.`category_id`=".$category_id;
 $kategoriListesi = array();
 $ps_product_category->untreeCat($category_id, $kategoriListesi);
 $qkat = " `#__{vm}_product_category_xref`.`category_id` IN(".$category_id . ",";  
 foreach ($kategoriListesi as $kat)
 {
  $qkat .= $kat . ',';
 }
 $qkat .= ")";

 $qkat = str_replace(',)', ')', $qkat);
 $where_clause[] = $qkat;
} else {
$where_clause[] = "`#__{vm}_product_category_xref`.`category_id`=".$category_id;
} 
 
 }
}

If we need hide category thumbnails comment line 106 in administrator/components/com_virtuemart/html/shop.browse.php

//$navigation_childlist = $tpl->fetch( 'common/categoryChildlist.tpl.php');