/**
* Categories view display method
* @return void
*/
function display($tpl = null)
{
Bt_portfolioLegacyHelper::getCSS();
$this->legacy = Bt_portfolioLegacyHelper::isLegacy();
// Set the toolbar
$this->addToolBar();
$buttons = $this->getButtons();
$this->assign('buttons', $buttons);
// Display the template
parent::display($tpl);
// Set the document
$this->setDocument();
}