Confirmation and task after the updation of update panel

Question

Hi all Recently I came across a task in which I used a update panel and a update progress. Everything is working fine except the last task when the update panel is updated is not taking place. For eg: I am downloading some data. For that I am making user to see the update panel with the progress indicator image. When the data is collected and written in the desired format and it has to come in a dialogue box over the screen nothing happens. Neither I am able to show user a confirmation message after the finishing the update process. Am i missing something ??? And one more thing during the panel is updated I freeze the GUI using a div and opacity of the div. Is it because of that ? Here is my HTML mark up:- asp:UpdatePanel ID =UpdatePanel1 runat =server> ContentTemplate > asp:Button ID =btnDwnload runat =server OnClick =btnDwnload_Click Style =text-align: center Text =Download UseSubmitBehavior =false /> ContentTemplate > asp:UpdatePanel > td > td style =text-align: center> asp:UpdateProgress ID =UpdateProgress2 runat =server AssociatedUpdatePanelID =UpdatePanel2> ProgressTemplate > div style =top: 0px; height: 1000px; background-color: White; opacity: 0.75; filter: alpha(opacity=55); vertical-align: middle; left: 0px; z-index: 999999; width: 1500px; position: absolute; text-align: center;> div > asp:Image ID =Image2 runat =server ImageUrl =~/images/indicator.gif Width =100px /> br /> Processing... ProgressTemplate > asp:UpdateProgress >