ComboBox with choose one as the first option

[scorp]

How can I have the first item as Choose one in the combo box which is bound to a collection in the viewbag

 @(Html.Telerik().ComboBox()
                                        .Name("continents")
                                        .SelectedIndex(0)
                                        .BindTo(new SelectList(ViewBag.Continents, "ContinentID", "Name"))
                                  )

[nachid]

see optionLabel