Cascading combo-box not functioning properly

[Xorv]

I've two combo-box(Countries and States). Combo-box 2 (States) should load associated States with the value selected in the Combo-box 1(Countries). Problem:- first time selection of a Countries combo-box item, loads the correct associated States in the 2nd combo-box. But when an another value is selected in combo-box 1. The Values inside combo-box still displays old values. NOTE:- On 2nd time NewValues are loaded properly in combo-box 2. But those are not displayed when the the combo-box arrow is click (Only old values are visible). But if we type anything in that 2nd combo-box, New values are displayed. QUESTION:- I want evertime the new values are loaded up in 2nd combo-box, it should be displayed on the click of combo-box arrow. Not just after typing something. CLASS:- protected void Countries_SelectedIndexChanged(Object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e) { int countryIDselected = Convert.ToInt32(Countries.SelectedValue); bool AdvanceSearchFlag = true; Session["AdvanceSearchFlag"] = AdvanceSearchFlag; Session["countryIDselected"] = countryIDselected.ToString(); int totalStates = States.Items.Count; int xyz = totalStates - 1; if (totalStates != 0) { while (totalStates > 0) { States.Items.Remove(totalStates - 1); totalStates --; } } States.Items.Clear(); } protected void States_ItemsRequested(object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e) { foreach (StateyLookupInfo state in StateLookupList.GetList(false)) { RadComboBoxItem item = new RadComboBoxItem(State.StateName, State.StateID.ToString()); comboBox.Items.Add(item); } } ASPX:- <telerik:RadComboBox ID="Countries" runat="server" AutoPostBack="True" OnSelectedIndexChanged="Countries_SelectedIndexChanged" /> <telerik:RadComboBox ID="States" runat="server" AutoPostBack="True" EnableLoadOnDemand="true" OnItemsRequested="States_ItemsRequested" />

[Dimitar Terziev]

Hello,

In order to force a request for items whenever the second RadComboBox is opened, the OnClientDropDownOpening event should be handled with the following implementation of the event handler function:

function OnClientDropDownOpening(sender, args) {

      if (sender.get_items().get_count() > 0)
          sender.requestItems("", false);
  }

Greetings,
Dimitar Terziev
the Telerik team