org.zkoss.zk.ui.processMask.enabled
From Documentation
Property:
org.zkoss.zk.ui.processMask.enabled
Applicable: globally in zk.xml via <library-property> not as <custom-attribute>
Default: false
Since 6.5.5
Specifies whether always to show a processing mask when doing a lengthy operation on the server side. The mask will cover the whole page to prevent users from interacting with UI like: