<window title="test.zul" border="normal">
	<include src="test.jsp" />
	<button label="invalidate">
		<attribute name="onClick">self.getSpaceOwner().invalidate();</attribute>
	</button> 
</window>

<%@ taglib prefix="zk" uri="http://www.zkoss.org/jsp/zul"%>
<zk:page zscriptLanguage="java">
		<zk:button label="test" sclass="item"  />
</zk:page>