comment_admin_overview is missing I am working on hook_theme_registry_alter. I have tried to dpm($theme_registry). But comment_admin_overview is missing, The version of drupal is 7. Any ideas??.

function hook_theme_registry_alter(&amp;$theme_registry) {
  dpm($theme_registry);
  $theme_registry['comment_admin_overview']['function'] = 'theme_hook_comment_admin_overview';
}
comment_admin_overview() is a form function in Drupal 7 (it was a theme function in 4, 5 &amp; 6).

You can use hook_form_alter() to make your changes instead.