<com:TContent ID="Content"> <h2 class="defect">TCheckBoxList demo js error on IE</h2> <com:TTextBox ID="TextBox" /> <com:TRequiredFieldValidator ID="validator1" ControlToValidate="TextBox" ErrorMessage="You must enter a value" Display="Dynamic" ValidationGroup="Group2" /> <com:TCheckBoxList AutoPostBack="true" ValidationGroup="Group2"> <com:TListItem Text="Agree" /> <com:TListItem Text="Disagree" /> </com:TCheckBoxList> </com:TContent>