AJAX AutoCompleteExtender控件问题?

在TEXTBOX第一次输入字符时,就会闪一下,焦点就会跳到别的地方去```重新把焦点跳回TEXTBOX就没有事了`这问题应该怎样解决??谢谢!
<asp:ScriptManager ID="ScriptManager1" runat="server" />
         <asp:TextBox ID="TextBox1" runat="server" EnableViewState="False"></asp:TextBox>
        <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="TextBox1" CompletionSetCount="10" CompletionInterval="1000"
        EnableCaching="true"
        ServicePath="WebService.asmx"
        ServiceMethod="GetCompleteList">
        </cc1:AutoCompleteExtender>

WEB:
[WebMethod]
    public string[] GetCompleteList(string prefixText, int count)
    {

       DataSet ds = new DataSet();
       ds = dt("select top " + count + " code from test where code like '"+prefixText.Trim()+"%'");
        List<String> list = new List<string>();
           if (ds.Tables[0].Rows.Count > 0)
            {
                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    list.Add(dr[0].ToString().Trim());

                }
            }
            return list.ToArray();
    }
--------------------编程问答-------------------- TextBox   放到外头去 !!
就是这样!!
<form id="form1" runat="server">
         <div>
              <asp:ScriptManager ID="ScriptManager1" runat="server">
            </asp:ScriptManager>
            <ajaxToolkit:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
        TargetControlID="TextBox1"
        CompletionSetCount="12"
        EnableCaching="true"
        MinimumPrefixLength="1"
        ServicePath="sql_test.asmx"
       CompletionListElementID="Panel1"
        ServiceMethod="GetCompleteList">
            </ajaxToolkit:AutoCompleteExtender>
        </div>

        <asp:TextBox ID="TextBox1" runat="server" ForeColor="Black"></asp:TextBox>
    </form> --------------------编程问答-------------------- 没有改变了,一样是这样的 --------------------编程问答-------------------- 你用了Css样式吧这个控件你用了新的css样式什么都会变的
最好是原装不动的试下
原装的是没问题的 --------------------编程问答-------------------- 什么都没有用啊```
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">

    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
        TargetControlID="TextBox1"
        CompletionSetCount="10"
        CompletionInterval="1000"
        EnableCaching="true"
        MinimumPrefixLength= "1"
        ServicePath="WebService.asmx"
        CompletionListElementID= "Panel1" ServiceMethod="GetCompleteList"
       >
        </cc1:AutoCompleteExtender>
        <asp:TextBox ID="TextBox1" runat="server" ForeColor= "Black"></asp:TextBox>
    </form>
</body>
</html> --------------------编程问答-------------------- 自己顶 --------------------编程问答-------------------- 我最近也在研究这个东东 --------------------编程问答-------------------- 顶一下。学习了。 --------------------编程问答-------------------- 我用这个控件也用不起来，读取文件里的内容进行提示可以，但读取数据库的不行

补充：.NET技术 ,  ASP.NET