org.zkoss.zul.include.mode
From Documentation
Property:
org.zkoss.zul.include.mode
Default: auto (5.0) Default: defer (3.x) [Since 3.6.2]
It specifies the default mode of the include component. In ZK 3 and prior, the default mode is defer, which is backward-compatible with the prior version. Since ZK 5, the default mode is auto for easier control.
For more information, please refer to ZK Component Reference.