public function ch_restrict_manage_posts()
 {
     global $wpdb, $wp_query;
     $qv = $wp_query->query_vars;
     if ($qv['post_type'] == $this->post_type) {
         $projects = PN_Project::get_list();
         echo '<select name="project_id">';
         echo '<option value="">' . __('All projects', PLUGINNAME_DOMAIN) . '</option>';
         foreach ($projects as $project) {
             $selected = (!empty($_GET['project_id']) and $_GET['project_id'] == $project->post->ID) ? 'selected="selected"' : '';
             echo '<option value="' . $project->post->ID . '" ' . $selected . '>' . $project->post->post_title . '</option>';
         }
         echo '</select>';
     }
 }