Administration Theme not working when theme selected for virtual site

Set up a workaround.

1. Installed Administration Theme module (http://drupal.org/project/admin_theme).
2. Added the following function to my custom module:
   

   
   function _needs_admin_theme() {
     $admin_theme_disallow = FALSE;
     $admin_theme = FALSE;
     
     // check if some paths are disallow to get the theme
     if (trim(variable_get('admin_theme_path_disallow', '')) != '') {
       // pages that are defined by their normal path
       $admin_theme_disallow = drupal_match_path($_GET['q'], variable_get('admin_theme_path_disallow', ''));
       
       // pages that are defined with their alias
       $alias = drupal_get_path_alias($_GET['q']);
       if ($alias != $_GET['q']) {
         $admin_theme_disallow = $admin_theme || drupal_match_path($alias, variable_get('admin_theme_path_disallow', ''));
       }
     }
     
     // we should not show the admin theme if the user has no access or the path is in the disallow list
     if (!user_access('access admin theme') || $admin_theme_disallow) {
       global $custom_theme;
       $custom_theme = '0';
       return;
     }
     
     $admin_theme = (arg(0) == 'admin' || (variable_get('node_admin_theme', '0') && arg(0) == 'node' && (arg(1) == 'add' || arg(2) == 'edit')));
     // check if an option is enabled and if it results to TRUE
     $list = admin_theme_list();
     foreach ($list as $info) {
       $var = admin_theme_variable_name($info['module'], $info['option']);
       if ((bool)variable_get($var, '0') && module_invoke($info['module'], 'admin_theme', 'check', $info['option'])) {
         $admin_theme = TRUE;
       }
     }
     
     // some custom defined pages should get admin theme
     if (trim(variable_get('admin_theme_path', '')) != '') {
       // pages that are defined by their normal path
       $admin_theme = $admin_theme || drupal_match_path($_GET['q'], variable_get('admin_theme_path', ''));
       
       // pages that are defined with their alias
       $alias = drupal_get_path_alias($_GET['q']);
       if ($alias != $_GET['q']) {
         $admin_theme = $admin_theme || drupal_match_path($alias, variable_get('admin_theme_path', ''));
       }
     }
     
     // Use the admin theme for the current request (if global admin theme setting is checked).
     return $admin_theme;
   }

   This code was adapted from the admin_theme.module and the system_init() hook in system.module

3. Replaced virtual_site_theme.module line 115 with the following:
   
   if (($context['theme']) && (!_needs_admin_theme())) {

I know this is a bit of a hack, but it accomplishes what I need for the time being.