add_action( 'submitpost_box', 'third_column_edit_form' );
add_action( 'submitpage_box', 'third_column_edit_form' );
function third_column_edit_form() {
    global $post_type, $post;
    //if( 'your-type' != $post_type )
    //  return;
    $side_meta_boxes2 = do_meta_boxes( $post_type, 'column3', $post );
}

add_action( 'admin_print_styles-post.php',     'third_column_css');
add_action( 'admin_print_styles-post-new.php', 'third_column_css');
function third_column_css () {
    ?>
    <style type="text/css">
    #side-info-column {
      width: 580px;
    }

    #post-body {
      margin-right: -620px !important;
    }

    #post-body-content {
      margin-right: 600px !important;
    }

    #column3-sortables {
      width: 280px;
      float: right;
      display: block;
      min-height: 200px;
    }

    #side-sortables {
      float: left;
      display: block;
      min-height: 200px;
    }

    /* Style copied from #side-sortables */

    #column3-sortables .category-tabs, #column3-sortables .category-tabs {
      margin-bottom: 3px;
    }

    #column3-sortables .category-tabs li, #column3-sortables .add-menu-item-tabs li {
      display: inline;
    }

    #column3-sortables .category-tabs a, #column3-sortables .add-menu-item-tabs a {
      text-decoration: none;
    }

    #column3-sortables .category-tabs .tabs a, #column3-sortables .add-menu-item-tabs .tabs a {
      color: #333;
    }
    </style>
    <?php
}