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It cause by below code

 if (!jq.nodeName(n, 'button', 'input', 'textarea', 'a', 'select', 'iframe'))
    return false;

in ZK 3, toolbutton is a "a" tag but we modify to a "div" in ZK 5

we will fix it after we decide it whether is a bug or spec

You can use client side to control it it is more fast then control from server

I create a sample

<zk xmlns:w="http://www.zkoss.org/2005/zk/client">
    <script type="text/javascript"><![CDATA[
        function foco(){
            jq("$btnGrabar").focus();
        }
    ]]></script>
    <button label="Foco" w:onClick="foco();"/>
    <toolbarbutton id="btnGrabar" label="Grabar"/>
</zk>

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