<zk>
    <zscript><![CDATA[
        int counter = 0;
        ListModelList items = new ListModelList();
    ]]></zscript>
    <div apply="org.zkoss.bind.BindComposer">
        <forEach items="@init(items)">
            <div>
                <label value="${each}"/>
                <if test="@init(true)">
                    conditional
                </if>
            </div>
        </forEach>
    </div>
    <button onClick="items.add(++counter)" label="add"/>
</zk>