title: Add Items to Telerik Ajax RadComboBox after populated from webservice
body: <p>I'm using the latest 2009 RadCombobox Ajax control and I'm using the build in functionality to populate it from a webservice.</p>
  
  <p>I would also like to push one more item to the box so the user has the choice of not choosing anything.  Essentially making the control optional.  Right now if they choose something and then change their mind, they can't change it back to nothing at all.</p>
  
  <p>Everytime I've tried adding something it doesn't work or completely clears what was populated from the webservice.  And I don't want the webservice to return and empty item just to make the control work.</p>
  
  <pre><code>&lt;telerik:RadComboBox ID="combo" runat="server"
                      Skin="Office2007"
                      AllowCustomText="false"
                      EnableLoadOnDemand="true" 
                      AppendDataBoundItems="true" 
                      Text=""
                      Width="300" Height="200"&gt;
                      &lt;ExpandAnimation Type="None" /&gt;
                      &lt;CollapseAnimation Type="None" /&gt;
                      &lt;WebServiceSettings Path="~/Service.asmx" Method="GetStuff" /&gt;
  
                  &lt;/telerik:RadComboBox&gt;
  </code></pre>
  
  <p>Thanks </p>