Add action links in custom module page
$items['admin/structure/types'] = array(
    'title' =&gt; 'Content types',
    'description' =&gt; 'Manage content types, including default status, front page promotion, comment settings, etc.',
    'page callback' =&gt; 'node_overview_types',
    'access arguments' =&gt; array('administer content types'),
    'file' =&gt; 'content_types.inc',
  );
  $items['admin/structure/types/list'] = array(
    'title' =&gt; 'List',
    'type' =&gt; MENU_DEFAULT_LOCAL_TASK,
    'weight' =&gt; -10,
  );
  $items['admin/structure/types/add'] = array(
    'title' =&gt; 'Add content type',
    'page callback' =&gt; 'drupal_get_form',
    'page arguments' =&gt; array('node_type_form'),
    'access arguments' =&gt; array('administer content types'),
    'type' =&gt; MENU_LOCAL_ACTION,
    'file' =&gt; 'content_types.inc',
  );


This is what exist on node.module, modify to set the type to MENU_LOCAL_ACTION

Hope that help.