Form elements of #type 'checkboxes' don't appear in the operation settings (Views UI).

Hi All,

I tried to add settings for operation in "Selected operations" fieldset. But when I added "checkboxes" form element, it wasn't showed correctly. Screenshots views_bulk_operations_form_1.png and views_bulk_operations_form_2.png show how was it shown (title, description, but no any checkboxes).

Here is the code of this form element:

  $form['nodeaccess_operations_grants'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Grant'),
    '#default_value' => variable_get('nodeaccess_operations_grants', array('grant_view')),
    '#options' => array('grant_view' => t('View'), 'grant_update' => t('Update'), 'grant_delete' => t('Delete')),
    '#description' => t('Please set what grants a user should be provided with by this operation.'),
  );

I copied this code to OPERATION_form() function and it works well there (screenshot action_form.png).

I checked the views_bulk_operations_plugin_style::options_form() in views_bulk_operations_plugin_style.inc, but didn't find any issues, all looks good there.

Could please somebody help me on this? I can't even imagine what is a reason of this issue :(

At present I use 3 "checkbox" instead of one "checkboxes" form element and they work well. But it's really strange that the "checkboxes" doesn't work...