KB#2428: Pass array of XML nodes to component PT

iwovGraduate

I am refering to KB: #2428: How to pass an array of XML nodes to a component template
https://support.interwoven.com/kb/kb_show_article2.asp?ArticleID=2428

Using this example, I do not see anything printed from within iw_iterate of component PT.
Am I doing something wrong ?

Here is what I have in the parent PT:
--------- Parent PT snippet ----------------------------
<iw_iterate var='performer' list='dcr.Performers'>
<iw_iterate var="product" list="performer.products">
<iw_include pt='templatedata/internet/pr/presentation/product.tpl'>
<![CDATA[
$iw_param{"alltracks"} = [iwpt_dcr_value("product.tracks")];
]]>
</iw_include>
</iw_iterate>
</iw_iterate>
------------------------------------------------------------

Snippet from component PT:
--------- component PT snippet -----------------------
<iw_iterate var='tr' list='( @{$iw_arg{"alltracks"}} )' >
<iw_value name="tr.track_title"/>
</iw_iterate>
------------------------------------------------------------

My datacapture.cfg looks something like this:
----------------- snippet from datacapture -----------
<item name="Performers">
<replicant max="1000">
<items.......>
<item name="products">
<replicant max="1000">
<items.......>
<item name="tracks">
<replicant max="1000">
<item name="track_title">
<text />
</item>
</replicant>
</item>
</replicant>
</item>
</replicant>
</item>
------------------------------------------------------------


W2K; TS 5.5.2; TST 5.5.2