Update progress not displaying after first postback

Hi,

I am using an updatepanel and an updateprogress control in my web page. I have places a combo box, a grid and a search button in the update panel. When I select the comob times then click on the search button the update progress is getting displayed for the first time but after that any number of times i select the combo items / click on the search button the update progress is not getting displayed.

Can you please provide me a solution for this?

Jerome