Setting automatic-timeout to true didn't redirect to timeout page based on session timeout time

<session-config>
	<device-type>ajax</device-type>
	<session-timeout>20</session-timeout>
	<timer-keep-alive>false</timer-keep-alive>
	<automatic-timeout>true</automatic-timeout>
	<timeout-uri>/timeout.zul</timeout-uri>
</session-config>

<zk>
	Test automatic-timeout with timer component
	<zscript><![CDATA[
	void show() {
		System.out.println("Timer");
	}
	]]></zscript>
	<timer id="timer" delay="1000" repeats="true" onTimer="show()" onCreate="self.start()" />
</zk>