Someone

<p:dataTable id="tagList" var="t" value="#{bean.tags}"
selection="#{bean.selectedTags}">

<p:column>#{t.name}</p:column>
<p:column selectionMode="multiple" style="width:14px" />

<f:facet name="footer">
<p:commandButton id="deleteTagsButton" styleClass="small" value="delete selected tags"
actionListener="#{bean.deleteSelectedTags}" />
</f:facet>

</p:dataTable>