DOCman 2.0 Stable - category listbox

category.html.php

<?= @helper('com://admin/docman.listbox.categories', array(
    'name' => 'category_id',
    'attribs' => array('id' => 'category'),
));
//file needs to be located in the currect folder structure in order to be found in this example:
//{site}/components/com_docman/views/myview/tmpl/category.html.php

DOCman 2.0 Stable - category listbox.php

<?
echo KObjectManager::getInstance()->getObject('com:koowa.view.page.html', array(
    'layout' => 'com://site/docman.myview.category',
));