Use wp_editor internal linking for metabox. Still a work in progress (adds autop when visual editor is selected)

gistfile1.txt

function nbc_dynamic_lead_link_meta_box( $post ) {
global $post;

  // Use nonce for verification
  wp_nonce_field( basename( __FILE__ ), 'nbc_dynamic_lead_link_nonce' );

  $link = get_post_meta( $post->ID, 'lead_link', true );

  $settings = array(
    'media_buttons' => false,
    'wpautop' => false,
    'textarea_rows' => 1,
    'tinymce' => false,
    'quicktags' => array( 'buttons' => 'link' )
  );
  wp_editor( $link, 'lead_link', $settings );

}

/**
 * Save our custom metabox data
 *
 */
function nbc_dynamic_lead_link_save( $post_id ) {
// verify this came from our screen and with proper authorization.
 
  if ( !wp_verify_nonce( $_POST['nbc_dynamic_lead_link_nonce'], basename(__FILE__) ) ) {
    return $post_id;
  }

  // check autosave
  if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
    return $post_id;


  // check permissions
  if ('page' == $_POST['post_type']) {
      if (!current_user_can('edit_page', $post_id)) {
          return $post_id;
      }
  } elseif (!current_user_can('edit_post', $post_id)) {
      return $post_id;
  }
 
  // OK, we're authenticated: we need to find and save the data
  $post = get_post( $post_id );
  if ( $post->post_type == 'dynamic-leads' ) {

     $old = get_post_meta( $post_id, 'lead_link', true );
     $new = $_POST['lead_link'];

     if ($new && $new != $old) {
        if ( strpos( $new, 'a href=' ) > 0 ) {
          preg_match( '!"([^"]+)"!', $new, $url );
          update_post_meta( $post_id, 'lead_link', $url[1] );
        } else {
          update_post_meta( $post_id, 'lead_link', esc_url( $new ) );
        }       
     } elseif ('' == $new && $old) {
        delete_post_meta( $post_id, 'lead_link', $old);
     }

  }
  return $lead_link;
 
}