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I believe you have to also specify the callback object.

$newParam['statoAsi'] = array(
      'title' => 'Stato Asi',
      'align' => 'center',
      'callback' => 'printAsiStatusIcon',
      'callback_object => $this
);

Something like that.

What I'm wondering is how parameters are sent to it.
I guess it just receives the value that correlates with it from the $db SELECTED results.