ZK: setting menuitem style programmtically

ZK's menuitem inherits setStyle but I couldn't get it work eg...

Menuitem menuItem = new Menuitem("Foo"));
menuItem.setStyle("font-weight:bold");

However, on the forums someone pointed out setting sclass works and then defining that class style in your zul.

eg..

Menuitem menuItem = new Menuitem("Foo"));
menuItem.setSclass("itembold");

in your zul:

<style>
.itembold .z-menuitem-text {font-weight: bold}
</style>