<com:TForm> <h1>TextBox AutoPostBack With Group Validation</h1> <com:TTextBox ID="Address" Columns="60" Maxlength="128" /> <com:TRequiredFieldValidator ID="validator1" ControlToValidate="Address" ValidationGroup="post" ErrorMessage="*" /> <com:TActiveTextBox AutoPostBack="true" ID="ZipCode" Columns="4" Maxlength="12" ValidationGroup="post" OnCallback="lookupZipCode"/> <com:TJavascriptLogger /> <com:TActiveTextBox ID="City" Columns="60" Maxlength="128" /> </com:TForm>