title: UpdateProgress not working for button which is in inside of trigger property
body: <pre><code>     &lt;asp:UpdatePanel ID="Upnl1" runat="server" UpdateMode="Conditional"&gt;
  &lt;ContentTemplate&gt;
        &lt;table width="100%"&gt;&lt;tr&gt;
                              &lt;td align="center" colspan="3"&gt;
                                  &lt;asp:Button ID="btnShowReport" runat="server" CssClass="ButtonClassLong" SkinID="LargeButton"
                                      Text="Show Report" OnClick="btnShowReport_Click"   TabIndex="15" /&gt;
                                  &lt;asp:Button ID="btnClear" runat="server" CssClass="ButtonClass" Text="Clear" OnClick="btn_Click"
                                      TabIndex="16" /&gt;
                                  &lt;asp:Button ID="btnClose" runat="server" CssClass="ButtonClass" OnClick="btnClose_Click"
                                      Text="Close" CausesValidation="False" TabIndex="17" /&gt;
                                  &lt;asp:CheckBox ID="ChkPrint" Text="Print View" runat="server" TabIndex="14" /&gt;
                              &lt;/td&gt;
                          &lt;/tr&gt;
                      &lt;/table&gt;&lt;/ContentTemplate&gt;
  &lt;Triggers&gt;
       &lt;asp:PostBackTrigger ControlID="btnShowReport" /&gt;
  &lt;/Triggers&gt;&lt;/asp:UpdatePanel&gt;&lt;asp:UpdateProgress ID="UpdateProgress" runat="server"&gt;
              &lt;ProgressTemplate&gt;
                  &lt;asp:Image ID="Image1" ImageUrl="~/App_Themes/RIBO/Images/Progress.gif" AlternateText="Processing"
                      runat="server" /&gt;
              &lt;/ProgressTemplate&gt;
          &lt;/asp:UpdateProgress&gt;
  </code></pre>
  
  <p>This is my coding , My issue is when i click the clear button the update progress working well, when i click btnShowReport it wont work.</p>
  
  <p>how to show the update progress for button click event which is in inside the trigger property.</p>