function sortSearchListQuery ($onlyPublished = TRUE, $virtuemart_category_id = FALSE, $group = FALSE, $nbrReturnProducts = FALSE, $params = array() ) {
if($this->debug === 1) vmTrace('sortSearchListQuery',FALSE,3);
$keyword = isset($params['keyword'])? $params['keyword'] : $this->keyword;
/*
* Plugins must return an array with product ids
*/
$result = array();
--> JPluginHelper::importPlugin('vmcustom');
$used = vDispatcher::trigger('plgVmMySortSearchListProductsQuery',
array(
&$result,
$keyword,
$onlyPublished,
$virtuemart_category_id,
$group,$nbrReturnProducts,
$params,
));
In administrator model product.php you have forgotten to say JPluginHelper::importPlugin('vmcustom'); before dispatch event for custom search plugin to develop.
Can this be included please?