I found a bug with the AutoCompleteExtender and added the bug to the CodePlex Project. I know this forum is not the place to post bugs, but I just want to make people aware of it. Below is the link to the bug

http://www.codeplex.com/AjaxControlToolkit/WorkItem/View.aspx?WorkItemId=18622

Further research indicates that the focus javascript statement that ASP.NET generates executes before the AutoCompleteExtender is initialized:

<script type="text/javascript">
//<![CDATA[
WebForm_AutoFocus('tb');Sys.Application.initialize();
Sys.Application.add_init(function() {
    $create(AjaxControlToolkit.AutoCompleteBehavior, {"delimiterCharacters":"","id":"tb_AutoCompleteExtender","serviceMethod":"GetCompletionList","servicePath":"/DWHomeExchange/Default2.aspx","useContextKey":true}, null, null, $get("tb"));
});
//]]>

You can avoid this by using the javascript ScriptManager pageLoad event to set focus which will happen after the Extender is initialized:

 
ScriptManager.RegisterStartupScript(this, this.GetType(), "focus", String.Format("function pageLoad() {{document.getElementById('{0}').focus();}}", tb.ClientID), true);
 

Hi,

I have tested your issue report in the issue tracker. The issue can be reproduced and we appreciate your sharing of the solution. The AjaxControlToolkit team would check your report and feed back in that page.

Thanks for your supporting of our forum and the AjaxControlToolkit.

Best regards,

Zhi-Qiang Ni

No problem.

 

Thank you for the solution

Sara