Usercontrol loding problem while using Ajax ModelPopUp

HI,
I have a problem with ajax Modalpopup ......

I am creating a tabed wizard that contains 3 tabs and 3 buttons(next previous, cancel ) in bottom , i am loading user controls on every tab , in user controls i am using Modalpopup to show and collect the data from user to save to DB. when I click on save button ,the 3 buttons(next previous cancel ) are become 6 like (next previous cancel,next,previous,cancel ).please help me........ how to solve the problem of displaying the controls 2 times.......