title: UpdateProgress linked to Multiple UpdatePanel controls
body: <p>Is there a way to have a single UpdateProgress control associated with mupltiple UpdatePanel controls?  something like this:</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server"&gt;
       &lt;ContentTemplate&gt;
       .....
       &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  
  &lt;asp:UpdatePanel ID="UpdatePanel2" runat="server"&gt;
       &lt;ContentTemplate&gt;
       .....
       &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  
  
  &lt;asp:UpdateProgress ID="UpdateProgress3" runat="server" AssociatedUpdatePanelID="UpdatePanel1, UpdatePanel2"&gt;.....
  </code></pre>