What is the property of the object Store in VB.Net similar to Store.Data in JavaScript?

I create a listview, bind with a webservice through an object store. But, the listview don´t has a Hidden column... then I would get directly from the object store the field 'Details' for the selected row in Listview. In a VB.Net, not JavaScript.

<ext:ListView 
                                                        ID="lstAgendasSalasSGE" 
                                                        runat="server"
                                                        SingleSelect="true"
                                                        EmptyText="Sem agendas disponíveis"
                                                        HideHeaders="true"
                                                        AutoScroll="true"
                                                        AnchorVertical="100%"
                                                        AnchorHorizontal="80%" >
                                                        <Store>
                                                            <ext:Store ID="Store1" runat="server">
                                                                <Proxy>
										                            <ext:HttpProxy Json="true" Method="POST" Url="~/App/JSonDataPaging.asmx/AgendasSalasSGE_List" />
									                            </Proxy>
									                            <Reader>
										                            <ext:JsonReader Root="d" IDProperty="IDAgendaSala">
                                                                        <Fields>
                                                                            <ext:RecordField Name="Descricao" />
                                                                            <ext:RecordField Name="Detalhes" />
                                                                        </Fields>
                                                                    </ext:JsonReader>
                                                                </Reader>
                                                            </ext:Store>
                                                        </Store>
                                                        <Columns>
                                                            <ext:ListViewColumn 
                                                                Header="" 
                                                                Width="0.11" 
                                                                Template='<img src="/resources/images/icons/agenda-sala.png" />' 
                                                                />
                                                            <ext:ListViewColumn 
                                                                Header="Descrição" 
                                                                Width="0.8" 
                                                                DataIndex="Descricao" 
                                                                />
                                                        </Columns>
                                                        <DirectEvents>
                                                            <SelectionChange OnEvent="SelectionChanged" />
                                                        </DirectEvents>
                                                        <%--<Listeners>
                                                            <SelectionChange Fn="selectionChaged" /> 
                                                        </Listeners>--%> 
                                                    </ext:ListView>
Thanks for any help.