RadGrid Batch Edit Problem

[Jalen]

I would like to use RadGrid in Batch Edit mode.

Here is my code:

<telerik:RadGrid RenderMode="Lightweight" runat="server" ID="gvOpSetting" AutoGenerateColumns="false" AllowPaging="true" MasterTableView-TableLayout="Fixed"
    OnNeedDataSource="gvOpSetting_NeedDataSource" AllowMultiRowSelection="true" OnItemDataBound="gvOpSetting_ItemDataBound" OnItemCommand="gvOpSetting_ItemCommand">
    <MasterTableView NoMasterRecordsText="No Data!!" DataKeyNames="WStationID,CtrlOrder" CommandItemDisplay="Top" EditMode="Batch" AutoGenerateColumns="false" Width="500px">
        <BatchEditingSettings EditType="Cell" OpenEditingEvent="Click"/>
        <Columns>
            <telerik:GridEditCommandColumn UniqueName="EditCommandColumn" Visible="false">
            </telerik:GridEditCommandColumn>
            <telerik:GridBoundColumn DataField="WStationID" Visible="false" HeaderStyle-Width="250px" />
            <telerik:GridBoundColumn DataField="CtrlOrder" Visible="false" />
            <telerik:GridBoundColumn DataField="CtrlItem" HeaderText="CtrlItem" />
            <telerik:GridNumericColumn DataField="StandardValue" HeaderText="StandardValue"
                SortExpression="StandardValue" UniqueName="StandardValue">
            </telerik:GridNumericColumn>
            <telerik:GridNumericColumn DataField="TolerancePlus" HeaderText="TolerancePlus"
                SortExpression="TolerancePlus" UniqueName="TolerancePlus">
            </telerik:GridNumericColumn>
            <telerik:GridNumericColumn DataField="ToleranceMinus" HeaderText="ToleranceMinus"
                SortExpression="ToleranceMinus" UniqueName="ToleranceMinus">
            </telerik:GridNumericColumn>
        </Columns>
        <NoRecordsTemplate>
            <table width="300px" border="0" cellpadding="20" cellspacing="20">
                <tr>
                    <td align="center">
                        <h2 style="color: black; font-size: xx-large; font-weight: bold;">No Data!!</h2>
                    </td>
                </tr>
            </table>
        </NoRecordsTemplate>
    </MasterTableView>
    <PagerStyle Mode="NextPrevAndNumeric" />
    <ClientSettings EnableRowHoverStyle="false" EnablePostBackOnRowClick="true" AllowKeyboardNavigation="true">
        <ClientEvents OnRowDblClick="rowDblClick" OnPopUpShowing="onPopUpShowing"/>
    </ClientSettings>
</telerik:RadGrid>

 

When I click cell into edit mode, a textbox show for a second, then it closed immediately.

I couldn't edit at all. 

Which setting did I miss?