ZK - IllegalStateException: UI can't be modified in the rendering phase

Situation:
index.zul

<?page id="foo"?>
<zk>
 <include id="header" mode="defer" src="/template/header.zul" />
 <include id="mainView" mode="defer" src="/discussion/list.zul" />
</zk>

list.zul

<div sclass="container" vflex="9" apply="org.zkoss.bind.BindComposer"
 viewModel="@id('vm') @init('com.vm.DiscussionListViewModel')">
 ........
 <button onClick="@command('Change')"/>
</div>

DiscussionListViewModel.java

@Command
public void buttonClick!() {
 Include i = (Include) Path.getComponent("//foo/mainView");
 i.setSrc("change.zul");
}

It will occur UI can't be modified problem, because of composer died before event finished.
You cannot change "include component" by the composers which are included in the "include component"

Rendering Phase：

The Rendering PhaseAfter all events are processed, ZK renders these components into a regular HTML page and sends this page to the browser.

Reference: [1]http://books.zkoss.org/wiki/ZK_Developer's_Guide/Fundamental_ZK/Basic_Concepts/Architecture_Overview