[Solved] How to populate data for multi-column RadComboBox dynamiclly?

[Hong]

<telerik:RadComboBox Width="150px" CssClass="ddlText" ID="UnionRadComboBox" runat="server" DataSourceID="dsUnionInfo" AppendDataBoundItems="true" DataTextField="Union_ID" DataValueField="Union_ID" Skin="Outlook" DropDownWidth="250px" SelectedValue='<%# Bind("Union_ID") %>' >
<items>                                                       <telerik:RadComboBoxItem Text="" Value = "" runat="server" />
</items>
<headertemplate>
<table class="ddlText" style="width: 250px; text-align: left; line-height: 10px">
<tr>
  <td style="width: 100px;">
     Union ID</td>
  <td style="width: 150px;">
     Description</td>
</tr>
</table>
</headertemplate>
<itemtemplate>
<table class="ddlText" style="width: 250px; text-align: left; line-height: 10px">
<tr>
   <td style="width: 100px;">
      <%#DataBinder.Eval(Container.DataItem, "Union_ID")%>
   </td>
   <td style="width: 150px;">
      <%#DataBinder.Eval(Container.DataItem, "Union_Description")%>
   </td>
</tr>
</table>
</itemtemplate>
</telerik:RadComboBox>

I have a 2-column RadComboBox as defined above. My question is how to populate data for those 2 columns in the "ItemsRequested" method dynamiclly in the code-behind file? 

Thanks,
Hong