help to add theme setting

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hi

I wanna add a select box setting in my theme so I use below code:

<?php

return new \IPS\Helpers\Form\Select("core_theme_setting_title_{$row['sc_id']}", $value ? explode(',', $value) : array(), false, array( 'options' => array (
  'activity' => 'Activity', 
  'forumtopic' => 'Forums',  
  'pages' => 'Pages', 
  'downloads' => 'Downloads', 
  'message' => 'message',
  'posts' => 'posts',
  'topics' => 'topics',
  ), 'parse' => 'normal', 'multiple' => true, 'unlimited' => '*', 'unlimitedLang' => 'all_items' ), NULL, NULL, NULL, 'theme_setting_' . $row['sc_key'] );

and use below codes in theme editor;

{{if theme.profile_items == 'activity'}} 
<!--activity-->
{{endif}} 
{{if theme.profile_items == 'forumtopic'}} 
<!--forumtopic-->
{{endif}} 
{{if theme.profile_items == 'pages'}} 
<!--pages-->
{{endif}} 
{{if theme.profile_items == 'downloads'}} 
<!--downloads-->
{{endif}} 
{{if theme.profile_items == 'message'}} 
<!--message-->
{{endif}} 
{{if theme.profile_items == 'posts'}} 
<!--posts-->
{{endif}} 
{{if theme.profile_items == 'topics'}}
<!--topics-->
{{endif}}

but when I select one item it's displayed at front but when I select more than one nothing is displayed.

 

what's the problem?