Problem creating a CCK field - doesn't appear in node view! (no problem)

Im currently creating a module for a new cck field. It does appear in the form, and LOOKS like it's saving data to the database, but it won't show in the node view! I've researched a lot, with no good reasults..

what am I doing wrong? here's my code:

// $Id: image_ref.module,v 0.3 2009/04/29 20:51:53 danyalejandro Exp $

function image_ref_field_info() {
  return array(
    'image_ref_number' => array(
      'label' => t('Referencia a imagen'),
      'description' => t('Guarda una referencia a un nodo tipo imagen.')
	),
  );
}

function image_ref_install() {
  content_notify('install', 'image_ref');
}
function image_ref_uninstall() {
  content_notify('uninstall', 'image_ref');
}
function image_ref_enable() {
  content_notify('enable', 'image_ref');
}
function image_ref_disable() {
  content_notify('disable', 'image_ref');
}


/**
 * Implementación de hook_field_settings().
 */
function image_ref_field_settings($op, $field) {
	switch ($op) {
		case 'database columns':
		if ($field['type'] == 'image_ref_number') {
			return array(
			'value' => array('type' => 'int', 'not null' => FALSE, 'sortable' => TRUE),);
		}

		case 'views data':
		$allowed_values = content_allowed_values($field);
			if (count($allowed_values)) {
				$data = content_views_field_views_data($field);
				$db_info = content_database_info($field);
				$table_alias = content_views_tablename($field);

				// Filter: Add a 'many to one' filter.
				$copy = $data[$table_alias][$field['field_name'] .'_value'];
				$copy['title'] = t('@label (!name) - Allowed values', array('@label' => t($field['widget']['label']), '!name' => $field['field_name']));
				$copy['filter']['handler'] = 'content_handler_filter_many_to_one';
				$copy['filter']['numeric'] = TRUE;
				unset($copy['field'], $copy['argument'], $copy['sort']);
				$data[$table_alias][$field['field_name'] .'_value_many_to_one'] = $copy;
				// Argument: swap the handler to the 'many to one' operator
				$data[$table_alias][$field['field_name'] .'_value']['argument']['handler'] = 'content_handler_argument_many_to_one';
				$data[$table_alias][$field['field_name'] .'_value']['argument']['numeric'] = TRUE;
				return $data;
			}
		break;
	}
}

/**
 * Implementación de hook_field().
 */
function image_ref_field($op, &$node, $field, &$items, $teaser, $page) {
	switch ($op) {
		/*
		case 'view':
			foreach ($items as $delta => $item) {
			$items[$delta]['view'] = content_format($field, $item, 'default', $node);
			}
			return theme('field', $node, $field, $items, $teaser, $page);
			break;*/
		case 'sanitize':
			foreach ($items as $delta => $item) {
				foreach ( $item as $col => $dat ) {
					$items[$delta]['safe_' . $col ] = check_plain($item[ $col ]);
				}
			}
			break;
	}
}

/**
 * Implementación de hook_content_is_empty().
 */
function image_ref_content_is_empty($item, $field) {
  if (empty($item['value']) && (string)$item['value'] !== '0') {
    return TRUE;
  }
  return FALSE;
}

/**
 * Implementación de FAPI hook_elements().
 */
function image_ref_elements() {
  return array(
    'image_ref' => array(
      '#input' => TRUE,
      '#columns' => array('value'), '#delta' => 0,
      '#process' => array('image_ref_process'),
    ),
  );
}

/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function image_ref_process($element, $edit, $form_state, $form) {
  drupal_add_js(drupal_get_path('module', 'image_ref') .'/image_ref_js.js');
  
  $field_name = $element['#field_name'];
  $field = $form['#field_info'][$field_name];
  $field_key  = $element['#columns'][0];

  $value = isset($element['#value'][$field_key]) ? $element['#value'][$field_key] : '';
  $value = isset($field['decimal']) ? str_replace('.', $field['decimal'], $value) : $value;
  $element[$field_key] = array(
    '#type' => 'textfield',
    '#default_value' => $value,
    '#size' => isset($field['precision']) ? $field['precision'] + 2 : 12,
    '#maxlength' => isset($field['precision']) ? $field['precision'] : 10,
    '#attributes' => array('class' => 'image_ref'),
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#field_name' => $element['#field_name'],
    '#type_name' => $element['#type_name'],
    '#delta' => $element['#delta'],
    '#columns' => $element['#columns'],
  );

  $prefixes = array();
  $suffixes = array();

  // Make sure we don't wipe out element validation added elsewhere.
  if (empty($element['#element_validate'])) {
    $element['#element_validate'] = array();
  }
  
  $element['#element_validate'][] = 'image_ref_number_validate';

  // Used so that hook_field('validate') knows where to flag an error.
  $element['_error_element'] = array(
    '#type' => 'value',
    '#value' => implode('][', array_merge($element['#parents'], array($field_key))),
  );

  return $element;
}

/**
 * Implementación de hook_widget_info().
 */
function image_ref_widget_info() {
  return array(
    'image_ref' => array(
      'label' => t('Selector de imagen (IB)'),
      'field types' => array('image_ref_number'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
  );
}

/**
 * Implementación de hook_widget().
 */
function image_ref_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  $element = array(
    '#type' => $field['widget']['type'],
    '#default_value' => isset($items[$delta]) ? $items[$delta] : NULL,
  );
  return $element;
}

/**
 * Implementación de hook_field_formatter_info().
 */
function image_ref_field_formatter_info() {
  return array(
    'default' => array(
		'label' => t('ID del nodo imagen'),
		'field types' => array('image_ref_number')
		),
  );
}

/**
 * Implementación de hook_theme().
 */
function image_ref_theme() {
  return array(
    'image_ref' => array('arguments' => array('element' => NULL)),
    'image_ref_formatter_default' => array('arguments' => array('element' => NULL)),
  );
}

/**
 * Proxy theme function for formatters.
 */
function theme_image_ref_formatter_default($element) {
	if( empty( $element['#item'] )) {
		return '';
	}

	$text = check_plain($element['#item']['data']['value']);
	return $text;
}

/**
 * FAPI validation of an individual integer element.
 */
function image_ref_number_validate($element, &$form_state) {
  $field_name = $element['#field_name'];
  $type_name = $element['#type_name'];
  $field = content_fields($field_name, $type_name);
  $field_key = $element['#columns'][0];
  $value = $element['#value'][$field_key];

  if (($element[$field_key]['#required'] || !empty($value))) {
    $start = $value;
    $value = preg_replace('@[^-0-9]@', '', $value);
    if ($start != $value) {
      $error_field = implode('][', $element['#parents']) .']['. $field_key;
      form_set_error($error_field, t('Only numbers are allowed in %field.', array('%field' => t($field['widget']['label']))));
    }
    else {
      form_set_value($element[$field_key], $value, $form_state);
    }
  }
}



/**
 * FAPI theme for an individual element.
 *
 
 * theme and the HTML output lives in $element['#children'].
 * Override this theme to make custom changes to the output.
 *
 * $element['#field_name'] contains the field name
 * $element['#delta]  is the position of this element in the group
 */
 
function theme_image_ref($element) {
	return $element['#children'];
}