This happens on IE 11 only so far (OS=windows 8.1). When you make the textbox visible to false, it causes javascript error. Please fix this bug. (sample attached).
Comments: Sorry, related changeset [819460ba6c5d](https://ajaxcontroltoolkit.codeplex.com/SourceControl/changeset/819460ba6c5d88f9c6fcbbeb0cec7cd3e00f1c76)
Comments: Sorry, related changeset [819460ba6c5d](https://ajaxcontroltoolkit.codeplex.com/SourceControl/changeset/819460ba6c5d88f9c6fcbbeb0cec7cd3e00f1c76)