CHECKBOX WITH CUSTOM POST TYPE TAGS
array(
'id' => 'unique_option_312',
'type' => 'checkbox',
'title' => 'Checkbox for CPT Tags',
'options' => 'tags',
'query_args' => array(
'taxonomies' => array( 'post_tag', 'your_tax' ),
'orderby' => 'post_date',
'order' => 'ASC',
),
),