title: multiple ajax updateprogress not working
body: <p>I have an asp.net page with three ajax updatepanels. in each panel there are some controls and each updatepanel as an ajax update progress control. first updatepanel has a dropdown which has autopostback = true. second and third updatepanels has this dropdown as asynpostback trigger. When I change selection in dropdown, only first updateprogress loading image appears while others don't appear. </p>
  
  <p>How can I fix it ?</p>