title: AsyncFileUpload UploadedComplete is called twice
body: <p>I am using AsyncFileupload. File is uploaded perfectly but twice, as the event OnUploaded complete is fired twice. I am using two Update panels as shown below </p>
  
  <pre><code>  &lt;asp:UpdatePanel ID="UpdatePanelTop" runat="server"&gt;
  &lt;Triggers&gt;
      &lt;asp:PostBackTrigger ControlID="ButtonSave" /&gt;
  &lt;/Triggers&gt;
  &lt;ContentTemplate&gt;
      &lt;uc1:Alert ID="Alert1" runat="server" /&gt;
      &lt;asp:Panel ID="PanelAdminUpload" runat="server"
          Width="90%"&gt;..........some code here .....
  &lt;asp:UpdatePanel runat="server" ID="UpdatePanelAFU"&gt;
              &lt;ContentTemplate&gt;
                  &lt;tr&gt;
                      &lt;td&gt;File: &lt;/td&gt;
                      &lt;td class="style1"&gt;
  
  
                                                      &lt;ajaxToolkit:AsyncFileUpload ID="AsyncFileUploadPub" runat="server"
                              ToolTip="Select the file"
                              OnUploadedComplete="AsyncFileUploadPub_UploadedComplete"
                              OnClientUploadComplete="uploadComplete"
                              UploaderStyle="Modern" UploadingBackColor="#CCFFFF" ThrobberID="myThrobber" /&gt;
                          &amp;nbsp;&lt;asp:Label runat="server" ID="myThrobber" Style="display: none;"&gt;&lt;img align="middle" alt="" src="../Styles/images/Animated Gif/Uploading.gif" /&gt;&lt;/asp:Label&gt;
  
                          &lt;asp:Label ID="LabelOpt" runat="server" Text="(Optional) "&gt;&lt;/asp:Label&gt;&lt;/td&gt;
                  &lt;/tr&gt;
                  &lt;tr&gt;
                      &lt;td&gt;File Details:&lt;/td&gt;
                      &lt;td&gt;
                          &lt;asp:Label runat="server" ID="lblFileDetails" Font-Italic="true"&gt;&lt;/asp:Label&gt;&lt;/td&gt;
                  &lt;/tr&gt;
              &lt;/ContentTemplate&gt;
          &lt;/asp:UpdatePanel&gt;
       ......some code here ....    &lt;/ContentTemplate&gt;
     &lt;/asp:UpdatePanel&gt;
  </code></pre>