How can I use the pageclass-suffix in vmart?

[be]

Hi,
I need on some elements in the category default.php the pageclass. Normally i can call them with

Code Select Expand

$this->pageclass_sfx;.
But this doesn´t work in VM.
How could I use the pageclass-suffix for Virtuemart?

Best regards

Joomlaversion 2.5.7 and VMart-Version 2.0.12f