ZK Configuration Reference/zk.xml/The Library Properties/org.zkoss.zul.nativebar

Property:

org.zkoss.zul.nativebar 

Applicable:
 globally in zk.xml via <library-property>
 nested in a zul file via <custom-attributes>

For mobile browsers. Default:false
[Since 7.0.4]

Default: true
[Since 7.0.2]

Default: false
[Since 7.0.0]

It specifies to use browser's default scrollbar for Grid, Listbox, Tree and Borderlayout component or not.