I actually had an issue where every time I would move from one tab to another the headers would change to undefined as seen below:
//Before
<TR class=sbs_InnerTR_header id=sbs_InnerTR_header_4>
<TD class=tabH1 id=heading_tlpr_sbs>
<DIV>
Priority
</DIV>
</TD>
<TD class=tabH1 id=heading_tlrt0_sbs>
<DIV>
Request Type
</DIV>
</TD>
</TR>
//After
<TR class=sbs_InnerTR_header id=sbs_InnerTR_header_4>
<TD class=tabH1 id=heading_tlpr_sbs>
<DIV>
Priority
</DIV>
</TD>
<TD id=heading_tlrt0_sbs>undefined
</TD>
I set up the fields with the header first and that resolved the issue.