Updatepanel gives full postback instead of asyncpostback

Question

I have run into what seems to be a very famous problem: My updatepanel fires a full postback instead of a async postback. The normal solution is to give all controls you add

Answer 1

I had the same experience when populating a CheckBoxList inside a ListView inside a Panel in an UpdatePanel. It was solved by adding this code in the CheckBoxList:

ClientIDMode="AutoID"