diff --git a/wp-trac-client/ajax.php b/wp-trac-client/ajax.php
index bfa25de..05ba5b5 100644
--- a/wp-trac-client/ajax.php
+++ b/wp-trac-client/ajax.php
@@ -1,5 +1,29 @@
 <?php
 
+/**
+ *
+ */
+add_action('wp_ajax_nopriv_wptc_username_autocomplete', 'wptc_username_suggestion_cb');
+add_action('wp_ajax_wptc_username_autocomplete', 'wptc_username_suggestion_cb');
+function wptc_username_suggestion_cb() {
+
+    $searchTerm = $_POST['term'];
+    // query wp_users table for the given term.
+    $users = array("abc", "cde");
+
+    $suggestions = array();
+    foreach($users as $user) {
+        $suggestion = array();
+        $suggestion['label'] = 'Display Name - Email';
+        $suggestion['value'] = 'user_login';
+        $suggestions[] = $suggestion;
+    }
+
+    $response = $_GET["callback"] . "(" . json_encode($suggestions) . ")";
+    echo $response;
+    exit;
+}
+
 /**
  * the ajax wrappers for the trac functions
  * The _cb suffix stands for Call Back
diff --git a/wp-trac-client/css/trac_ticket.css b/wp-trac-client/css/trac_ticket.css
index b9c3c84..522c829 100644
--- a/wp-trac-client/css/trac_ticket.css
+++ b/wp-trac-client/css/trac_ticket.css
@@ -388,3 +388,8 @@ h1 span, h2 span { color: gray; font-size: 90%;}
  font-size: 80%;
  margin-top: 14px;
 }
+
+/* auto complete loading */
+.ui-autocomplete-loading {
+  background: white url('../images/ui-anim_basic_16x16.gif') right center no-repeat;
+}
diff --git a/wp-trac-client/images/ui-anim_basic_16x16.gif b/wp-trac-client/images/ui-anim_basic_16x16.gif
new file mode 100644
index 0000000..084ecb8
Binary files /dev/null and b/wp-trac-client/images/ui-anim_basic_16x16.gif differ
diff --git a/wp-trac-client/js/trac-wikitoolbar.js b/wp-trac-client/js/trac-wikitoolbar.js
index 76250ae..a5531c3 100644
--- a/wp-trac-client/js/trac-wikitoolbar.js
+++ b/wp-trac-client/js/trac-wikitoolbar.js
@@ -1,6 +1,7 @@
 
 (function($){
-  
+
+  // trac wiki toolbar  
   window.addWikiFormattingToolbar = function(textarea) {
     if ((document.selection == undefined)
      && (textarea.setSelectionRange == undefined)) {
@@ -124,6 +125,21 @@ jQuery(document).ready(function($) {
   // attach folding function to foldable class.
   $(".foldable").enableFolding(false, true);
 
+  // username auto complete for re-assign action.
+  var wptc_username_ac = "wptc_username_autocomplete"
+  $("#action_reassign_reassign_owner").autocomplete({
+      source: function(request, response) {
+          $.getJSON(WptcAjaxObj.url + "?callback=?&action=" +
+                    wptc_username_ac, request, response);
+      },
+      minLength: 2,
+      select: function(event, ui) {
+          // selected value could get from ui param.
+          // ui.item.id, ui.item.value.
+          alert (ui.item.value);
+      }
+  });
+
   // only enable control elements for 
   // the currently selected action
   var actions = $("#action input[name='action']");
diff --git a/wp-trac-client/templates/page-ticket-details.php b/wp-trac-client/templates/page-ticket-details.php
index 9e41ece..4e18fe5 100644
--- a/wp-trac-client/templates/page-ticket-details.php
+++ b/wp-trac-client/templates/page-ticket-details.php
@@ -3,9 +3,13 @@
  * Template Name: Trac Ticket Details
  * Description: a page to show the details for a ticket.
  */
+wp_enqueue_script('jquery-ui-autocomplete');
 // enqueue styles and scripts for trac project.
 wp_enqueue_style('wptc-trac-ticket');
 wp_enqueue_script('wptc-trac-wikitoolbar');
+wp_localize_script('wptc-trac-wikitoolbar', 'WptcAjaxObj', 
+    array('url' => admin_url('admin-ajax.php')));
+wp_enqueue_style('jquery-ui');
 
 // you may not need the following section if you
 // don't have tiny-mce comments plugin installed.
diff --git a/wp-trac-client/widgets.php b/wp-trac-client/widgets.php
index 87771ca..9de5853 100644
--- a/wp-trac-client/widgets.php
+++ b/wp-trac-client/widgets.php
@@ -469,14 +469,13 @@ function wptc_widget_action_resolve($action) {
 function wptc_widget_action_reassign($action) {
 
     $fields = $action[3][0];
-    $options = wptc_widget_options_html($fields[2], $fields[1]);
+    //$options = wptc_widget_options_html($fields[2], $fields[1]);
     // the resolve is a select element.
     // it will be disabled untile the radio button is selected.
     $select = <<<EOT
 to  
-<select name="{$fields[0]}" id="{$fields[0]}" disabled="">
-  {$options}
-</select>
+<input name="action_reassign_reassign_owner" id="action_reassign_reassign_owner" disabled="">
+{$options}
 EOT;
 
     return apply_filters('wptc_widget_action_reassign', $select);
diff --git a/wp-trac-client/wp-trac-client.php b/wp-trac-client/wp-trac-client.php
index f1e6185..0efae5f 100644
--- a/wp-trac-client/wp-trac-client.php
+++ b/wp-trac-client/wp-trac-client.php
@@ -87,7 +87,10 @@ function register_resources() {
     // using wp_enqueue_style to load this css.
     // jquery ui dialog style seens not automatically loaded.
     wp_register_style('jquery-ui',
-                      'https://ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/base/jquery-ui.css');
+                      'https://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css');
+    // javascript for autocomplete.
+    wp_register_script('wptc-autocomplete',
+                       plugins_url('wt-trac-client/js/wptc-autocomplete.js'));
 }
 
 function get_wptc_client() {