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dhtmlxtabbar iframe and content

Hello,

I want use DHTMLXTabbar and i want know if it possible to have a tab bar in which we use the balise content in certain tab and href in other. My XML example is next and it doesn't completely run.
The two last tab run correctly but not the two first.
What is the solution ?
Thanks
Steve

<?xml version="1.0" encoding='iso-8859-1'?>
<tabbar hrefmode="iframes">
<row>
<tab id="b1" width='100px' selected="1">Preview
    <content>
        Content Text
    </content>
        </tab>
<tab id="b2" width='100px'>Source
    <content>
        Content Text
    </content>

        </tab>
        <tab id="b3" width='100px' href='http://www.google.com'>csv
</tab>
        <tab id="b4" width='100px' href='http://www.yahoo.com'>pdf
        </tab>
</row>
</tabbar>