So I've created an empty web site in VS 2012 and now unable to validate anything. Initially I started getting the UnobtrusiveValidationMode error but after reading the following thread I was able to get rid of the error. However, the validation is still not working. All I have is a textbox, required field validator, validatorcalloutextender and a button.
http://forums.asp.net/p/1867358/5259046.aspx?Re+Strange+Validation+with+validation+controls