gistfile1.txt

<?php
/**
 * @file
 */

/**
 * Plugin definition.
 */
$plugin =  array(
  'vih_link_button' => array(
    'title' => t('Button'),
    'description'   => t('Render links list as buttons'),
    'render pane' => 'vih_plugins_link_render_pane',
  ),
);

/**
 * Render callback
 *
 * @ingroup themable
 */
function theme_vih_plugins_link_render_pane($vars) {
  $settings = $vars['settings'];
  $content = $vars['content'];
  return 'ready to be styled as buttons?';
}