Progress template in the middle of content template

Question

I have a gridview in update panel and I am doing paging in that, I want update progress while paging

 <asp:UpdateProgress ID="upGvFinishProg" runat="server" AssociatedUpdatePanelID="upGvFinish" DisplayAfter="0">
                    <ProgressTemplate>
                        <center>
                        Loading ....
                        </center>
                    </ProgressTemplate>

But this is showing me text below of the gridview. I want this to be shown in the middle of gridview, i.e. middle of the content template of update panel