$options_panel->CloseTab();
/**
 * Open admin page 3rd tab
 */
$options_panel->OpenTab('options_3');
/**
 * Add fields to your admin page 3rd tab
 * 
 * Editor options:
 *   WYSIWYG (tinyMCE editor)
 *  Syntax code editor (css,html,js,php)
 */
//title
$options_panel->Title(__("Editor Options", "apc"));
//wysiwyg field
$options_panel->addWysiwyg('wysiwyg_field_id', array('name' => __('My wysiwyg Editor ', 'apc'), 'desc' => __('wysiwyg field description', 'apc')));
//code editor field
$options_panel->addCode('code_field_id', array('name' => __('Code Editor ', 'apc'), 'syntax' => 'php', 'desc' => __('code editor field description', 'apc')));
/**
 * Close 3rd tab
 */
$options_panel->CloseTab();
/**
 * Open admin page 4th tab
 */
$options_panel->OpenTab('options_4');
/**
 * Add fields to your admin page 4th tab
 * 
 * WordPress Options:
 *   Taxonomies dropdown