The input cells should use the same id as the column headers, reusing the constants like self::PARAM_LBL and self::PARAM_SRC.

ex) (from links above)

<th id="th-<?php echo $eid, '-', self::PARAM_SRC ?>">

should correspond with

<td headers="th-<?php echo $eid?>-cf7">

but note the cf7 is static (and incorrect anyhow).