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RadAjaxManagerProxy Issue

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jerry
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jerry asked on 23 Dec 2008, 05:16 PM
Whenever I add this piece of code
<telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">  
        <AjaxSettings> 
          <telerik:AjaxSetting AjaxControlID="ddlStudy">  
            <UpdatedControls> 
              <telerik:AjaxUpdatedControl ControlID="lstDataset" /> 
            </UpdatedControls> 
          </telerik:AjaxSetting> 
        </AjaxSettings> 
      </telerik:RadAjaxManagerProxy> 

I get this poping up next to my List Box(lstDataset) - I don't have a lstDatasetPanel within my project.
2715|updatePanel|ctl00_ctl00_ContentPlaceHolder1_lstDatasetPanel

What i'm doing is on change of a drop down I want to populate the list box with the data.  When I try and change the drop down more then once it gives me this error:

"Microsoft JScript runtime error: Sys.InvalidOperationException: Could not find UpdatePanel with ID 'ctl00_ctl00_ContentPlaceHolder1_lstDatasetPanel'. If it is being updated dynamically then it must be inside another UpdatePanel."

Thank You
Jerry

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