Since beta 2 is here, I decided yesterday to update beta 1 version of my project. I always tell my self not to touch things still they work, but as usual the new things are attractive. I already hed expirience of migrating from "Atlas" to "Ajax" - thats was real hurt. But I did not think that so meny diffrence will be from one beta to another and shame on me :). After updating ajax extention library my project totaly failed to run, Jscrpit failure something with 'Sys' object was wrong. Not likable error at 01:00AM. Well googling did not bring the desired results. Then I created new ajax enabled project and copied all related web.config settings to my project. Fourtunately project is working. Must stop this 'try a new staff' things...