Loader not working proper

Question

I have use UpdateProgress for display loader first time loader display properly and after finish loading data ,data will display properly but second time when i click on loader or anywhere in screen data not reflected in gridview.

 

<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">

   <ProgressTemplate>

      <div class="divWaiting">

            <asp:Image ID="imgWait" runat="server" ImageAlign="Middle" ImageUrl="~/Content/Images/loader.gif" />

      </div>

   </ProgressTemplat>

</asp:UpdateProgress>