[Solved] Can't set selected value on client side

[Pete]

Here's my client code:

Client: <span class="comboBox">
                        <%:Html.Telerik().ComboBox()
                                 .Name("ClientComboBox")
                                 .SelectedIndex(0)
                                 .BindTo(new SelectList(Model.ClientComboBox.Data, "Key", "Value"))
                                 .ClientEvents(events => events
                                                             .OnChange("onClientComboBoxChange"))
               %>

and the javascript:

$(function () {

if ($('#ClientId').val() > 0) {
        var combobox = $('#ClientComboBox').data('tComboBox');


        alert(combobox); // IS NULL
        combobox.select($('#ClientId').val());
        }

// More code in ready handler

Following the documentation, but combobox variable is null... please advise

Thanks
Pete