Multiple selection RadComboBox triggering OnSelectedIndexChanged

[Bruno]

I have the following scenario: 

<%-- UF --%>
    <tr>
        <td>
            <label>UF</label>
            <br />
            <telerik:RadComboBox ID="rcbUF" runat="server" CheckBoxes="True" EnableCheckAllItemsCheckBox="True" CausesValidation="false"
                Culture="pt-BR" CssClass="lt-width-10" MaxHeight="250" OnItemChecked="rcbUF_ItemChecked" AutoPostBack="true">
            </telerik:RadComboBox>
        </td>
    </tr>
    <%-- Rodovia --%>
        <tr>
            <td>
                <label>Rodovia</label>
                <br />
                <asp:UpdatePanel runat="server" ID="uppRodovia">
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="rcbUF" />
                    </Triggers>
                    <ContentTemplate>
                        <telerik:RadComboBox ID="rcbRodovia" runat="server" CheckBoxes="True" EnableCheckAllItemsCheckBox="True" Culture="pt-BR" MaxHeight="250" CssClass="lt-width-10" />
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>

When an item is checked on rcbUF, the following method is called (something like that):

protected void rcbUF_ItemChecked(object sender, RadComboBoxItemEventArgs e)
    {
    if (rcbUF.HasSelectedValue())
    {
        var _listaUF = rcbUF.Items.Where(x => x.Checked).Select(x => x.Value).ToList();
        var _rodovias = Repositorio<Rodovia>.GetAll.Where(x => x.ListaUF.Any(y=>_listaUF.Contains(y.UF.Id))).Select(x => x.Id).ToArray();

        if (_listaUF.Count > 0)
        {
            rcbRodovia.Carregar<Rodovia>(x => x.Numero, x => x.Id,
                Constantes.TextoVazioEspaco,
                true,
                x => _rodovias.Contains(x.Id),
                x => x.Numero);
        }
        else
        {
            rcbRodovia.Carregar<Rodovia>(x => x.Numero, x => x.Id,
                Constantes.TextoVazioEspaco,
                true,
                x => x.Numero);
        }

        rcbRodovia.Items.Distinct();
        rcbRodovia.Enabled = true;
    }
    }

My problem is that everytime I click on the item instead of the checkbox, it triggers a postback (much on the OnItemSelected way), and I really don't want it to occur.

Later I tried setting the rcbUF OnClientSelectedIndexChanging event to trigger this function:

function OnClientSelectedIndexChanging(sender, args)
{
    args.set_cancel(true);
}

But the event never fires, like it does fire the codebehind event but not the client-side one.

[Nencho]

Hello Bruno,

I am afraid, that the desired functionality is not supported, since clicking on the item's text is closely related with checking the correspondent checkbox, in a CheckBox scenario. If you want to handle the server-side event, a PostBack should occur.

Regards,
Nencho
Telerik