Created Unassigned: AjaxControlToolKit undefined error [27661]

I have updated the AjaxControlToolkit from 4.1.60919 to 4.1.7.1213 version. After upgradign I am getting "AjaxControlToolKit" undefined error at runtime.

I had the below issue with 4.1.60919

If the control id has a special character, get$ method is failing to get the handle of it where as document.getElementid was successfully able to read that control. Is this issue was addressed in new release ?

Thanks in Advance,
Srikanth