I'm not able to send a file to the server in internet explorer when fileuploadfield is inside a GridPanel item ... anyone have any suggestions of what to do?

see the code:

	<ext:FieldSet ID="fdsAnexo" runat="server" Layout="Form" LabelAlign="Top" Width="480" Collapsible="true" AutoHeight="true" AutoDataBind="true" Title='<%# Html.GetText("Arquivo") %>' Cls=" 		required x-form-item-block">
                <Items>
                    <ext:GridPanel ID="grdArquivo" runat="server" StoreID="storeArquivo" Height="250" Width="455" Frame="true" Cls="x-form-item-block" AutoDataBind="true" Title='<%# Html.GetText("Anexo") %>' EnableDragDrop="true" TrackMouseOver="true" StripeRows="true" AutoHeight="true" >
                        <ColumnModel ID="ColumnModel2" runat="server" >
                            <Columns>
                                <ext:Column DataIndex="nmArquivo" AutoDataBind="true" Header='<%# Html.GetText("Arquivo") %>' Width="405"> 
                                    <Editor>
                                        <ext:FileUploadField runat="server" AutoDataBind="true" ID="fuArquivo" Icon="Attach" ButtonOnly="false" ButtonText='<%# Html.GetText("Selecionar") %>'  EmptyText='<%# Html.GetText("CliqueParaEnviar") %>'>
                                            <Listeners>
                                                <FileSelected Handler="this.fireEvent('blur', this);" />
                                            </Listeners>
                                        </ext:FileUploadField>
                                    </Editor>
                                </ext:Column>
                            </Columns>
                        </ColumnModel>
                        <SelectionModel>
                            <ext:CheckboxSelectionModel ID="CheckboxSelectionModel1" runat="server" />
                        </SelectionModel>

                        <Plugins>
                            <ext:GridPanelMaintainScrollPositionOnRefresh ID="GridPanelMaintainScrollPositionOnRefresh1" runat="server"  />
                            <ext:EditableGrid ID="EditableGrid1" runat="server" />
                        </Plugins>
                        <BottomBar>
                            <ext:Toolbar ID="Toolbar2" runat="server">
                                <Items>
                                    <ext:Button ID="Button1" Text="Adicionar" Icon="Add" runat="server" AutoDataBind="true" IDMode="Parent" >
                                        <Listeners>
                                            <Click Handler="var rowIndex = #{grdArquivo}.addRecord(); #{grdArquivo}.getView().focusRow(rowIndex); #{grdArquivo}.startEditing(rowIndex, 0);" />
                                        </Listeners>
                                    </ext:Button>
                                    <ext:Button ID="Button2" Text="Excluir" Icon="Delete" runat="server">
                                        <Listeners>
                                            <Click Handler="#{grdArquivo}.deleteSelected();" />
                                        </Listeners>
                                    </ext:Button>
                                </Items>
                            </ext:Toolbar>
                        </BottomBar>
                    </ext:GridPanel>
                </Items>
            </ext:FieldSet>