I am also having the same problem with MultiPageView. button style displays properly only for fist active page.
answered on 05 Jan 2009, 08:08 AM
For your convenience we paste the answer to Cedric here in the forum thread as well:
As the inital state of the button is hidden, it does not have width and appears bad. You may use the inbuilt pageLoad function of asp.net ajax to set with to the button on page load. This will fix the things: