Drupal: Custom node edit menu callback, image upload widget disappears when change file

I had an issue with a custom node edit menu callback, that when the remove button is clicked to replace the current uploaded image, the whole widget disappears. I already loaded node.pages.inc file as follows: module_load_include('inc', 'node', 'node.pages'); BUT, apparently you should add these line to the menu item array: 'file path' => drupal_get_path('module', 'node'), 'file' => 'node.pages.inc', …