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我在formview的insertemplate和edittemplate中使用了ajax的autocompleteextender控件，它在inserttemplate中工作正常，但是当我尝试编辑内容时，它会给出如下错误：

扩展器控件“AutoCompleteExtender1”不是已注册的扩展器控件。在调用 RegisterScriptDescriptors() 之前，必须使用 RegisterExtenderControl() 注册扩展器控件。

我使用了以下代码：

<asp:FormView ID="FV1" runat="server" DefaultMode="Insert" DataKeyNames="ID" OnItemInserting="FV1_ItemInserting"
DataSourceID="sqlds1" OnDataBound="FV1_DataBound" OnItemUpdating="FV1_ItemUpdating">
<InsertItemTemplate>
    <asp:Panel runat="server" ID="pnl1">
        <table border="0" cellspacing="0" cellpadding="0" width="100%" class="small-blocks">
            <div class="left" style="margin: 20px 10px 10px 0px;">
                <img src="images/icon-plane.png" width="25" height="21" alt="" /></div>
            <tr>
                <td>
                    list
                </td>
            </tr>
            <tr>
                <td>
                    <asp:TextBox ID="txtlist" runat="server" class="textfield-bk2" OnTextChanged="txtlist_TextChanged"
                        AutoPostBack="true"></asp:TextBox>
                    <cc1:AutoCompleteExtender ServiceMethod="Searchlist" MinimumPrefixLength="1" CompletionInterval="100"
                        EnableCaching="true" CompletionSetCount="10" TargetControlID="txtlist" ID="AutoCompleteExtender1"
                        runat="server" FirstRowSelected="true">
                    </cc1:AutoCompleteExtender>
            </tr>
        </table>
    </asp:Panel>
</InsertItemTemplate>
<EditItemTemplate>
    <asp:Panel runat="server" ID="pnl1">
        <table border="0" cellspacing="0" cellpadding="0" width="100%" class="small-blocks">
            <div class="left" style="margin: 20px 10px 10px 0px;">
                <img src="images/icon-plane.png" width="25" height="21" alt="" /></div>
            <tr>
                <td>
                    list
                </td>
            </tr>
            <tr>
                <td>
                    <asp:TextBox ID="txtlist" runat="server" class="textfield-bk2" OnTextChanged="txtFrom_TextChanged"
                        AutoPostBack="true"></asp:TextBox>
                    <cc1:AutoCompleteExtender ServiceMethod="Searchlist" MinimumPrefixLength="1" CompletionInterval="100"
                        EnableCaching="true" CompletionSetCount="10" TargetControlID="txtlist" ID="AutoCompleteExtender1"
                        runat="server" FirstRowSelected="true">
                    </cc1:AutoCompleteExtender>
            </tr>
        </table>
    </asp:Panel>
</EditItemTemplate>

我应该怎么做才能解决这个问题？先感谢您。

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