iamchamith 0 Junior Poster in Training

hi friend,
i am useing asp.net 2008... My question is....
I want insert ajax to my web form...Then i download ajax toolkit & import it to the web folder...Now all ajax compornet are in tool box avaiable...But...
when i use this controls it is not appear in my web form...[when i drog & drop it is appear then set targencontrolID property control is hidden]...

what am i doo... Please help me...