Hi Mark,
I tried using tabbed panel for a test form,but din faced the issue as you mentioned. The code is as follows
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:tabbedPanel id="tabbedPanel1">
<xp:tabPanel label="Personal Data" id="tabPanel1">
<xp:table>
<xp:tr>
<xp:td>
<xp:label value="First Name" id="label1"></xp:label>
</xp:td>
<xp:td>
<xp:inputText id="inputText1"></xp:inputText>
</xp:td>
</xp:tr>
<xp:tr>
<xp:td>
<xp:label value="Last Name" id="label2"></xp:label>
</xp:td>
<xp:td>
<xp:inputText id="inputText2"></xp:inputText>
</xp:td>
</xp:tr>
<xp:tr>
<xp:td>
<xp:label value="Email" id="label3"></xp:label>
</xp:td>
<xp:td>
<xp:inputText id="inputText3"></xp:inputText>
</xp:td>
</xp:tr>
</xp:table>
</xp:tabPanel>
<xp:tabPanel label="Other Data" id="tabPanel2">
<xp:fileUpload id="fileUpload1"></xp:fileUpload></xp:tabPanel>
</xp:tabbedPanel></xp:view>
Hope this helps.