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<?php
// from https://gist.github.com/cliffordp/73e26f831d3b88c1a6c2
// see also: http://v2.pagelinestheme.com/150

// PageLines Framework: Add Custom Post Type (CPT) to Page Options
add_filter( 'postsmeta_settings_array', 'pl_control_cpt' );

function pl_control_cpt( $array ) {
  //1st one
  $cpt = 'vendors'; //EDIT THIS FOR YOUR CUSTOM POST TYPE NAME
  
  global $metapanel_options;
  
  $array[ $cpt ] = array(
    'metapanel' => $metapanel_options->posts_metapanel( $cpt ),
  );
  
  $array[ $cpt . '_archive' ] = array(
    'metapanel' => $metapanel_options->posts_metapanel( $cpt . '_archive' ),
  );
  
  //copy and paste from above to add a 2nd CPT
  return $array;
}