HOW TO: Add menus to the WordPress 3.1 admin bar

This was posted to the wp-hackers list by Frank Bültge and I didn’t want to lose it.  Here is how to add a new menu item to the admin bar:

function wp_codex_search_form() {
  global $wp_admin_bar, $wpdb;

  if ( !is_super_admin() || !is_admin_bar_showing() )
   $codex_search = '<form target="_blank" method="get" action="" style="margin:2px 0 0;">
 <input type="text" onblur="this.value=(this.value==\'\') ? \'Search the
Codex\' : this.value;" onfocus="this.value=(this.value==\'Search the
Codex\') ? \'\' : this.value;" maxlength="100" value="Search the Codex"
 <button type="submit">

 /* Add the main siteadmin menu item */
  $wp_admin_bar->add_menu( array( 'id' => 'codex_search', 'title' => 'Search
Codex', 'href' => FALSE ) );
   $wp_admin_bar->add_menu( array( 'parent' => 'codex_search', 'title' =>
$codex_search, 'href' => FALSE ) );

add_action( 'admin_bar_menu', 'wp_codex_search_form', 1000 );

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