Node form – self changing theme
You need to implement hook_admin_paths() to tell Drupal to use the admin theme for your URL pattern:


  Modules may specify whether or not the paths they define in hook_menu() are to be considered administrative. Other modules may use this information to display those pages differently (e.g. in a modal overlay, or in a different theme).


In your case the code would look a lot like this:

function MYMODULE_admin_paths() {
  $paths = array(
    'node/*/edit-full' =&gt; TRUE
  );
  return $paths;
}


Once you've cleared the caches your pages should now be using the admin theme.