<zk>
    <button label="Get selected count">
    <attribute name="onClick"><![CDATA[
    mytree.getSelectedCount();
    ]]></attribute>
    </button>
    <zscript><![CDATA[    
    List items = Collections.nCopies(50000, "test");
    ]]></zscript>
    <tree id="mytree" mold="paging" pageSize="2">
        <treecols>
            <treecol label="Column 1" />
        </treecols>
        <treechildren>
            <treeitem forEach="${items}">
                <treerow>
                    <treecell label="${forEachStatus.index}"/>
                </treerow>
            </treeitem>
        </treechildren>
    </tree>
</zk>