How to set FieldLabel in bind Gridpanel?

[rainer]

<ext:GridPanel ID="GridPanel1" runat="server" Width="300" Height="200" HideHeaders="true" Title="EditableGrid Plugin">
                                <Store>
                                    <ext:Store ID="Store1" runat="server">
                                        <Reader>
                                            <ext:JsonReader>
                                                <Fields>
                                                    <ext:RecordField Name="Value" Type="Int" />
                                                    <ext:RecordField Name="Text" Type="String" />
                                                </Fields>
                                            </ext:JsonReader>
                                        </Reader>
                                    </ext:Store>
                                </Store>
                                <Plugins>
                                    <ext:EditableGrid ID="EditableGrid1" runat="server" />
                                </Plugins>
                                <ColumnModel>
                                    <Columns>
                                        <ext:RowNumbererColumn />
                                        <ext:Column Header="Value" DataIndex="Value" Width="130" Sortable="true">
                                            <Editor>
                                                <ext:NumberField ID="NumberField1" FieldLabel="{Text}" LabelWidth="60" runat="server" AllowBlank="false" >
                                                </ext:NumberField>
                                            </Editor>
                                        </ext:Column>
                                        <ext:Column Header="Text" DataIndex="Text" Width="130" Sortable="true">
                                            <Editor>
                                                <ext:TextField ID="TextField1" runat="server" AllowBlank="false" />
                                            </Editor>
                                        </ext:Column>
                                    </Columns>
                                </ColumnModel>
                            </ext:GridPanel>

Use this method , It is not Work, can you help me ?