UpdataPanel与FormView的问题

各位大老，
在我的程序中，为了避免FormView输入数据时候更新，将FormView放在一个UpdatePanel内，
该Formview初始状态为ReadOnly，在用户点击遍编之后，进入编辑状态，
在编辑状态时，有一段JavaScript代码控制特定TextBox输入时候弹出一个日期选择，
问题在于，没有UpdatePanel时候，代码可以正确出来，但是加了UpdatePanel之后，
Formview的状态切换到编辑状态时，其页面代码仍然为ReadOnly，（也就是说，
虽然编辑框已经出现，客户端状态没有变化）。请教如何解决？
其中的Canlendar是一个开源的js日历控件，可以在www.dynarch.com/projects/calendar下载
以下为代码：<asp:UpdatePanel ID="UptPanel" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            //此处为一个单独的TextBox，测试脚本是否能够正确运行，经测试，运行没有问题
            <script type="text/javascript">
 
                function InitCalendar()
                {
                Calendar.setup(
         {         
           inputField     :    document.getElementById("<%=(TextBox1.FindControl("TextBox1")).ClientID%>"),      // id of the input field
           ifFormat       :    "%Y-%m-%d",       // format of the input field
           showsTime      :    false,            // will display a time selector         
           button         :    "TextBox1",   // trigger for the calendar (button ID)         
           singleClick    :    false,           // double-click mode         
           step           :    1                // show all years in drop-down boxes (instead of every other year as default)  
         }
         )
                }
         
                Sys.WebForms.PageRequestManager.getInstance().add_endRequest(InitCalendar);
       
            </script>            <asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource1">
           //EditItemTemplate使用这段脚本不行，状态没有切换，请教？？？
                <EditItemTemplate>
                    equipment_run_date:
                    <asp:TextBox ID="equipment_run_dateTextBox" runat="server" Text='<%# Bind("equipment_run_date","{0:yyyy-MM-dd}") %>'>
                    </asp:TextBox><br />                    <script type="text/javascript">                    
                    function InitCalendar()
                   {
                       Calendar.setup(
                      {         
                           inputField     :    document.getElementById("<%=((TextBox)FormView1.FindControl("equipment_run_dateTextBox")).ClientID%>"),      // id of the input field
                           ifFormat       :    "%Y-%m-%d",       // format of the input field
                           showsTime      :    false,            // will display a time selector         
                           button         :    "TextBox1",   // trigger for the calendar (button ID)         
                           singleClick    :    false,           // double-click mode         
                           step           :    1                // show all years in drop-down boxes (instead of every other year as default)  
                      }
                      )
                    }         
                    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(InitCalendar);
       
                    </script>                    <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
                        Text="更新">
                    </asp:LinkButton>
                    <asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                        Text="取消">
                    </asp:LinkButton>
                </EditItemTemplate>
                <ItemTemplate>
                    equipment_run_date:
                    <asp:Label ID="equipment_run_dateLabel" runat="server" Text='<%# Bind("equipment_run_date") %>'>
                    </asp:Label><br />
                    <asp:LinkButton ID="NewButton" runat="server" CausesValidation="True" CommandName="New"
                        Text="新建">
                    </asp:LinkButton>
                    <asp:LinkButton ID="EditButton" runat="server" CausesValidation="True" CommandName="Edit"
                        Text="编辑" OnClick="EditButton_Click">
                    </asp:LinkButton>
                    <asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                        Text="取消">
                    </asp:LinkButton>
                </ItemTemplate>
                <InsertItemTemplate>
                    equipment_run_date:
                    <asp:TextBox ID="equipment_run_dateTextBox" runat="server" Text='<%# Bind("equipment_run_date") %>'>
                    </asp:TextBox><br />
                    <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert"
                        Text="插入">
                    </asp:LinkButton>
                    <asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
                        Text="取消">
                    </asp:LinkButton>
                </InsertItemTemplate>
            </asp:FormView>
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NACConnectionString %>"
                SelectCommand="SELECT [equipment_run_date] FROM [t_brch_mng]"></asp:SqlDataSource>
            <br />
        </ContentTemplate>
    </asp:UpdatePanel>