how do I add a field to the auction table?

Hi thanks for the module

Im just trying to get a new field in the auction form.

I can do this by editing the module code but id rather write my own module and edit the form with hook alter.

usually I would do something like

function mymodule_form_alter(&$form, $form_state, $form_id) {

  switch ($form_id) {

    case 'uc_auction_bid_table_form':

	$form['example'] = array(
		'#title' => t('example title'),
		'#type' => 'textfield',
	);


  }

}

?>

This just isnt working though.

I can use this method to edit the current fields on the form but not add my own.