[CLOSED] Get multiple RecordID from GridPanel

[Mario]

I need to get RecordID from GridPanel rows selected... but only the IDProperty field.

My code:

        <ext:GridPanel runat="server" ID="GridPanelRisultato" MarginSpec="2 0 0 0" Flex="1" Border="true">
            <Store>
                <ext:Store runat="server" ID="StoreRisultato">
                    <Model>
                        <ext:Model runat="server" IDProperty="CodiceUtente">
                            <Fields>
                                <ext:ModelField Name="CodiceTipoUtente" Type="String" />
                                <ext:ModelField Name="CodiceUtente" Type="String" />
                                <ext:ModelField Name="Cognome" Type="String" />
                                <ext:ModelField Name="Nome" Type="String" />
                                <ext:ModelField Name="RagioneSociale" Type="String" />
                                <ext:ModelField Name="Stato" Type="String" />
                            </Fields>
                        </ext:Model>
                    </Model>
                </ext:Store>
            </Store>
            <ColumnModel runat="server" EnableColumnHide="False">
                <Columns>
                    <ext:ComponentColumn runat="server" DataIndex="CodiceTipoUtente" Width="22">
                        <Component>
                            <ext:Image runat="server"  Height="20"/>
                        </Component>
                        <Listeners>
                            <BeforeBind Handler="e.config[0].imageUrl = Ext.net.ResourceMgr.resolveUrl(Ext.String.format('~/Immagini/{0}.png', e.record.data.CodiceTipoUtente));" />
                        </Listeners>
                    </ext:ComponentColumn>
                    <ext:Column runat="server" Text="CodiceUtente" DataIndex="CodiceUtente" Width="100"/>
                    <ext:Column runat="server" Text="Cognome" DataIndex="Cognome" Width="100"/>
                    <ext:Column runat="server" Text="Nome" DataIndex="Nome" Width="100"/>
                    <ext:Column runat="server" Text="RagioneSociale" DataIndex="RagioneSociale" Flex="1"/>
                    <ext:Column runat="server" Text="Stato" DataIndex="Stato" Width="100"/>
                </Columns>
            </ColumnModel>
            <SelectionModel>
                <ext:RowSelectionModel runat="server" Mode="Multi" >
                    <DirectEvents>
                        <Select OnEvent="RowSelection_Event" />
                    </DirectEvents>
                </ext:RowSelectionModel>
            </SelectionModel>
            <Plugins>
                <ext:FilterHeader runat="server" />
            </Plugins>
        </ext:GridPanel>

    Protected Sub RowSelection_Event(sender As Object, e As Ext.Net.DirectEventArgs)
        Dim Selezione As Ext.Net.RowSelectionModel = TryCast(GridPanelRisultato.GetSelectionModel(), Ext.Net.RowSelectionModel)

        Dim Elenco As New StringBuilder()

        For Each Riga As Ext.Net.SelectedRow In Selezione.SelectedRows
            Elenco.AppendFormat("RecordID: {0} ", Riga.RecordID)
        Next

    End Sub

If I select two rows, the RowSelectionModel return zero rows !

Help please