This didn't really answer the question.  I have a tab control on the page already and a button within the tab control that gets pressed.  When I debug the code behind, the label gets changed; however, it never gets refreshed on the screen.  I know it is possible to do this because I have done it on another project in the past.  The problem is I can't remember how I did it.  I thought there was a setting somehwere in the ultratab properties page that allows you to add control names to be able to update on an asynchronous postback.  But I can't for the life of me find it.  I can't find it in the help screens either.