[Solved] Problem using client side code for combobox

[Jeanne Kornkven]

I want to add an item to the RadComboBox on the client side.  I have copied the suggested code, but it does not work.  The error comes at the line combo.get_items().add(comboItem);. The error message is 'undefined' is null or not an objet

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="pnl_iChoose_Hrchy.ascx.vb"
    Inherits="WebUserControls_pnl_iChoose_Hrchy"%>
<asp:Panel ID="pnlAjax" runat="server" >
    <table class="tblPanel" >
        <col class="leftCell" />
        <col class="rightCell" />
        <tr>
            <td>
                Dept:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlDepartment" AutoPostBack="true" EnableLoadOnDemand="True"
                    ShowDropDownOnTextboxClick="false" OnClientSelectedIndexChanged="ddlDept_SelIChng">
                    <WebServiceSettings Method="loadDepartment" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
        <tr>
            <td>
                Class:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlClass" AutoPostBack="true" EnableLoadOnDemand="True"
                    OnClientItemsRequesting="hrchy_itmReq_Dpt">
                    <WebServiceSettings Method="loadClass" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
        <tr>
            <td>
                Subclass:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlSubClass" AutoPostBack="true" EnableLoadOnDemand="True">
                    <WebServiceSettings Method="loadSubClass" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
        <tr>
            <td>
                Vendor:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlSupplier" AutoPostBack="true" EnableLoadOnDemand="True">
                    <WebServiceSettings Method="loadVendor" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
        <tr>
            <td>
                Vendor Style:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlStyle" AutoPostBack="true" EnableLoadOnDemand="True">
                    <WebServiceSettings Method="loadStyle" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
        <tr>
            <td>
                SEA CDE:
            </td>
            <td>
                <telerik:RadComboBox runat="server" ID="ddlSeason" EnableLoadOnDemand="True">
                    <WebServiceSettings Method="loadSeaCde" Path="../WebServices/srvc_ComboBox.asmx" />
                </telerik:RadComboBox>
            </td>
        </tr>
         <tr>
            <td>
                Vendor PID:
            </td>
            <td>
                <telerik:RadTextBox ID="txtPID" runat="server">
                    <ClientEvents OnFocus="ShowResultTab" OnKeyPress="RetrieveOnEnter" />
                </telerik:RadTextBox></td>
        </tr>
        <tr>
            <td>
                Created Since:
            </td>
            <td>
                <telerik:RadDatePicker runat="server" Skin="WebBlue" ID="dpSince" SharedCalendarID="sharedCal"
                    Width="80px" >
                    <DateInput ID="diSince" runat="server" onclick="dp_PUpdating(this.id);">
                    </DateInput>
                    <DatePopupButton ImageUrl="~/App_Themes/BlueBT2009/Calendar/Cal.gif" onclick="dp_PUpdating(this.id);" />
                </telerik:RadDatePicker>
            </td>
        </tr>

    </table>
    <telerik:RadCalendar runat="server" ID="sharedCal">
    </telerik:RadCalendar>

</asp:Panel>

 This RadComboBox is on a user control that is contained in a RadPanelItem.  The RadPanelItem is contained in a RadPane.  The RadPane is contained in a RadSplitter.

 function pnlHierarchyBackFeed(sql) {
            try {
                var sqlt = trim(sql);
                var arry = sqlt.split(' '); ;
                var combo;
                var str;
                var x;
                for (x in arry) {
                    str = arry[x + 2];
                    switch (arry[x]) {
                        case 'DEPT_ID':
                            combo = $find("<%= Me.ddlDepartment.ClientID %>");
                            var comboItem = new Telerik.Web.UI.RadComboBoxItem();
                            comboItem.set_text(str);
                            combo.trackChanges();
                            combo.get_items().add(comboItem);
                            comboItem.select();
                            combo.commitChanges();
                            break;
                        case 'CLASS_ID':
                            combo = $find("<%= Me.ddlClass.ClientID %>");
                            var comboItem = new Telerik.Web.UI.RadComboBoxItem();
                            comboItem.set_text(str);
                            combo.trackChanges();
                            combo.get_items().add(comboItem);
                            comboItem.select();
                            combo.commitChanges();
                            break;

                        default:

                    }
                    x = x + 2;
                }
            }
            catch (err) {
                alert(err.message);
            }
        }

[Jeanne Kornkven]

I've found the problem, and it is not with the combobox.  The issue was with my subscripting.