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✏️ Editing: admin-menu-import-export.html.php

<h2 class="nav-tab-wrapper">
        <?php foreach( $tabs as $tab => $name ): ?>
            <?php if( $tab == $active_tab ): ?>
                <span class="nav-tab nav-tab-active"><?php echo esc_html( $name ) ?></span>
            <?php else: ?>
                <a href="<?php echo add_query_arg( 'tab', $tab );?>" target="" class="nav-tab "><?php echo $name ?></a>
            <?php endif; ?>
        <?php endforeach; ?>
    </h2>

// postboxes
            <?php
            global $wp_version;
            if(version_compare($wp_version,"2.7-alpha", "<")){
                echo "add_postbox_toggles('nf_import_export_$active_tab');"; //For WP2.6 and below
            }
            else{
                echo "postboxes.add_postbox_toggles('nf_import_export_$active_tab');"; //For WP2.7 and above
            }
            ?>

});
    </script>

</div>

MR SKB