hi am  a begginner in using  ajax....  currently am  working  with asp.net  ajax beta 1.0(Former Atlas)...  i have some doubts on  UPDATE PANEL AND SCRIPT MANAGER ....my scenario i svery simple. but i dint know how to do that.. i have 2 dropdownlists  2ND dropdown Should be Populated when we select a value in 1st dropdown and without any postback flickering.. i have dragedd 2 dropdowns into updatepanel accompanied by a script manager.

Population or Databinding  of 2nd dropdown doing well,but thre is flickering due to  Post back..  can any one help me 2 use these UPDATE PANEL AND SCRIPT MANAGER CONTROLS FOR  PARTIAL  POSTBACKING...