Using implicit object with EL

I'm using JSP 2.0 with the built-in EL eval. So I've got displaytag-12.tld set up and everything works fine, except that I can't address the implicit row object through EL. EL is definitely functioning in this environment, so it's not a bigger issue. It's specifically related to accessing the implicit row object in display tables.

So I have something like this:

<display:table name="model.leads" id="lead">
<display:column>
${lead_rowNum}:
<c:choose>
<c:when test="${lead == null}">
LEAD IS NULL
</c:when>
<c:otherwise>
LEAD IS NOT NULL
</c:otherwise>
</c:choose>
${lead.leadNumber}
</display:column>
<display:column property="leadName"/>
</display:table>

I know that this is finding my list of items because I get a display for the leadName column. But for the lead_rowNum and any properties on the lead object, I get null. So the resulting table looks like this:

LEAD IS NULL Customer, Name

I also know that EL is working in my pages, since I have a number of other bits of data displayed throughout the page using EL on maps and various beans. Why can I not address the implicit objects directly through EL?

Any help would be greatly appreciated!