Telerik: RadComboBox How do delete all the items and add a new list -

i using telerik radcombobox drop down list inside user control in web forms application. need delete items in box, let's id ddlveihiclemake , repopulate new list of item passed function. here example of understand should like,

function addnewitems(selectref, optionsarray, valuesarray) {     var combo = document.getelementbyid("ctl00_cpmain_ctl01_appradpaneltabvehicleinformation_i0_i0_tabvehicleinformation_ddlvehiclemake_input");     combo.get_items().clear();     (var idx = 0; idx < optionsarray.length; idx++) {          if (valuesarray == "") {             var comboitem = new telerik.web.ui.radcomboboxitem();             comboitem.set_text(optionsarray[idx]);             combo.trackchanges();             combo.get_items().add(comboitem);         } else {             var comboitem = new telerik.web.ui.radcomboboxitem();             comboitem.set_text(optionsarray[idx]);             combo.trackchanges();             combo.get_items().add(comboitem);         }      } 

it fails me on get_items().clear() , get_itmes().add(comboitem). appreciate can get.

thanks!

try this:

function deleteitems(sender, args) {     var combo = window.$find("<%= cbomycombobox.clientid %>");     combo.trackchanges();     (var = 0; < combo.get_items().get_count(); i++) {         combo.get_items().remove(combo.get_items().getitem(i));     }     combo.commitchanges(); }