title: Telerik RadComboBox javascript API problem
body: <p>I've been having a problem using the javascript API of the RadComboBox from Telerik. And no I don't have the power to switch over from Telerik to jQuery or another framework.. Suffice to say I have hardly any hair left on my head now :P</p>
  
  <p><strong>In a nutshell</strong> I want to grab the selected index of one RadComboBox, and update another RadComboBox to this index. Eg. selecting a value in the first RCB automatically updates the second on the client side. My problem really is that I can't find a way to set the index on the second RCB, even though the docs says there is an easy way to do it .. (you heard that one before right :) </p>
  
  <p>I've followed the API docs at this page (<a href="http://www.telerik.com/help/aspnet/combobox/combo_client_model.html" rel="nofollow noreferrer">telerik docs</a>), and also used the javascript debugger in IE8 and the excellent FireBug in Firefox. I'm using Telerik.Web.UI assembly version 2009.2.826.20</p>
  
  <p><strong>I don't need full source for a solution, but a nudge in the right direction would be much appreciated! :)</strong></p>
  
  <p>Here's some example code I cooked together: </p>
  
  <hr>
  
  <pre><code>    &lt;form id="form1" runat="server"&gt;
      &lt;asp:ScriptManager ID="ScriptManager1" runat="server" /&gt;
  
      &lt;script type="text/javascript" language="javascript"&gt;
          function masterChanged(item)
          {
              var detailCB = &lt;%= DetailCB.ClientID %&gt;;
  
              var index = item.get_selectedIndex();
              detailCB.SetSelected(index);             //method does not exist, but should according to the docs..
  
          }
      &lt;/script&gt;
  
      &lt;div&gt;
          &lt;telerik:RadComboBox ID="MasterCB" runat="server" OnClientSelectedIndexChanged="masterChanged"&gt;
              &lt;Items&gt;
                  &lt;telerik:RadComboBoxItem Text="One" Value="1" runat="server" /&gt;                
                  &lt;telerik:RadComboBoxItem Text="Two" Value="2" runat="server" /&gt;
                  &lt;telerik:RadComboBoxItem Text="Three" Value="3" runat="server" /&gt;
              &lt;/Items&gt;
          &lt;/telerik:RadComboBox&gt;
      &lt;/div&gt;
  
      &lt;div&gt;
          &lt;telerik:RadComboBox ID="DetailCB" runat="server"&gt;
              &lt;Items&gt;
                  &lt;telerik:RadComboBoxItem Text="One" Value="1" runat="server" /&gt;                
                  &lt;telerik:RadComboBoxItem Text="Two" Value="2" runat="server" /&gt;
                  &lt;telerik:RadComboBoxItem Text="Three" Value="3" runat="server" /&gt;
              &lt;/Items&gt;
          &lt;/telerik:RadComboBox&gt;
      &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>I don't need full source for a solution, but a kick in the right direction would be much appreciated! :)</p>