[Ext.Net]GridPanel行选择右键菜单

<script type="text/javascript">
            function deleteuser() {
                var record = ItemGrid.getSelectionModel().getSelected();
                alert("删除物料："+record.data.MB001.toString());
                //Ext.net.DirectMethods.Deletestudent(record.data.stuid.toString());
            }
        </script>

<ext:Menu ID="Menu1" runat="server">
        <Items>
            <ext:MenuItem ID="MenuDel" runat="server"  Icon="Delete" Text="删除用户">
                <Listeners>
                    <Click Fn="deleteuser" />
                </Listeners>
            </ext:MenuItem>
            <ext:MenuItem ID="MenuEdit" runat="server" Icon="PackageGo" Text="修改用户">
                <Listeners>      
                </Listeners>
            </ext:MenuItem>
        </Items>
    </ext:Menu>
    <ext:GridPanel ID="ItemGrid" runat="server" StoreID="ItemStore" Width="760" Height="500"
        Title="测试序号宽度自适应" ContextMenuID="Menu1">
        <ColumnModel ID="ColumnModel2" runat="server">
            <Columns>
                <ext:RowNumbererColumn />
                <ext:Column Header="品号" DataIndex="MB001" Width="160" />
                <ext:Column Header="品名" DataIndex="MB002" Width="180" />
                <ext:Column Header="规格" DataIndex="MB003" Width="180" />
            </Columns>
        </ColumnModel>
        <SelectionModel>
            <ext:RowSelectionModel runat="server" ID="r1">
            </ext:RowSelectionModel>
        </SelectionModel>
        <Listeners>
            <ViewReady Handler="AutoRowNumbererColumn();" />
        </Listeners>
    </ext:GridPanel>