ASPxGridView GetSelectedFieldValues not retrieving values

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VB

ASP.NET

DevExpress

Hi all!

I'm trying to get the only one selected value (radio button) from an ASPxGridView control and followed the steps from the documentation on DevExpress.

The only thing I want is to retrieve one field and display into a label via button_click

Here goes the code...

Protected Sub ASPxButton1_Click(sender As Object, e As EventArgs) Handles ASPxButton1.Click
        Dim oRowVal As List(Of Object)
        Dim oVal As Object
        oRowVal = ASPxGridView1.GetSelectedFieldValues({"No_"})
        oVal = oRowVal(0)
        Label1.Text = oVal.ToString
    End Sub

And this is the ASP code for the controls...

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    <br />
    <dx:ASPxButton ID="ASPxButton1"  runat="server" AutoPostBack="False" Text="ASPxButton" Theme="BlackGlass" Width="150px">
    </dx:ASPxButton>
    <dx:ASPxGridView ID="ASPxGridView1"  runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" EnableTheming="True" Theme="BlackGlass">
        <Columns>
            <dx:GridViewCommandColumn ShowSelectCheckbox="True" VisibleIndex="0">
                <ClearFilterButton Visible="True">
                </ClearFilterButton>
            </dx:GridViewCommandColumn>
            <dx:GridViewDataTextColumn Caption="GP" FieldName="No_" VisibleIndex="1">
            </dx:GridViewDataTextColumn>
            <dx:GridViewDataTextColumn Caption="Description" FieldName="Descripción Grupo" VisibleIndex="2">
            </dx:GridViewDataTextColumn>
        </Columns>
        <SettingsBehavior AllowSelectSingleRowOnly="True" />
        <Settings ShowFilterRow="True" ShowGroupPanel="True" />
    </dx:ASPxGridView>

Many thanks in advance!!!