UpdateProgress contorl not working with UpdatePanel's Trigger

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ASP.NET

Ajax

Hi experts,

i am wokring on a form where i am using a UpdatePanel,here is the code for update panel

<asp:UpdatePanel ID="UpdatePanel2" runat="server">
                                          <ContentTemplate>
                                              <table border="0" width="100%" cellspacing="0" cellpadding="9" align="center">
                                                  <tr runat="server" id="trStores" visible="true">
                                                      <td align="right" valign="top" width="34%">
                                                          Select Store:
                                                      </td>
                                                      <td align="left" width="65%">
                                                          <asp:CheckBoxList ID="chkStores" runat="server">
                                                              <asp:ListItem Value="-1">All Stores</asp:ListItem>
                                                          </asp:CheckBoxList>
                                                      </td>
                                                  </tr>
                                              </table>
                                          </ContentTemplate>
                                          <Triggers>
                                              <asp:AsyncPostBackTrigger ControlID="ddlMerchant" EventName="TextChanged" />
                                          </Triggers>
                                      </asp:UpdatePanel>

In the updatePanel i have used the Trigger because the control which is firing the the event is outside update panel.
here i am having a Dropdown outside the update panel.

<asp:DropDownList ID="ddlMerchant" runat="server" Width="210px" AutoPostBack="true"
                                               OnSelectedIndexChanged="ddlMerchant_SelectedIndexChanged">
                                           </asp:DropDownList>

till now the working fine,but now i want to use the UpdateProgress here is the code,

<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel2">
                       <ProgressTemplate>
                           Loading....
                       </ProgressTemplate>
                   </asp:UpdateProgress>

Now the problem is UpdateProgress is not displaying the message?


but if put the dropdown inside the updatepanel and remove the Trigger the this updateProgress work fine.

it means UpdateProgress is not working with Trigger..


So help me to dipslay the UPdateProgress using trigger in Update panel