how to migrate

Hi i have these multiboxes in my JSP

<html:multibox property="selectedPDFSignatures" value="PDF_SIG" name="manageVPForm" onclick="setPdfChildSignatures(this)"/>
<html:multibox property="selectedPDFSignatures" value="PDF_SIG_TS" name="manageVPForm" onclick="setPdfChildSignatures(this)"/>
<html:multibox property="selectedPDFSignatures" value="PDF_SIG_TS_RI" name="manageVPForm" onclick="setPdfChildSignatures(this)"/>
<html:multibox property="selectedPDFSignatures" value="PDF_SIG_TS" name="manageVPForm" onclick="setPdfChildSignatures(this)"/>
<html:multibox property="selectedPDFSignatures" value="PDF_SIG_TS_RI" name="manageVPForm" onclick="setPdfChildSignatures(this)"/>

i have done something like this for first checkbox

<s:iterator var="row" value="%{manageVPForm.selectedPDFSignatures}">
<input type="checkbox" name="manageVPForm.checked" value="${row.PDF_SIG}" <s:property value="%{manageVPForm.checked.contains(#row.PDF_SIG)?'checked='checked'':''}"/>/>    
</s:iterator>

but it does not solved my problem, can you please tell me how to migrate all above checkboxes ? i have also seen this question on stackoverflow but it is not working for me Question