box-o-sand/PracticingFlex/03f1-custom-components/com/mycustom/components/TextInputEmail.as

package com.mycustom.components
{
    import mx.controls.TextInput;
    import mx.events.ValidationResultEvent;
    import mx.validators.EmailValidator;
    import flash.events.Event;
    import mx.validators.ValidationResult;

    public class TextInputEmail extends TextInput
    {
        private var emailValidator:EmailValidator = new EmailValidator();
        private var validator:ValidationResultEvent;

        public function TextInputEmail()
        {
            super();
            this.emailValidator.source = this;
            this.emailValidator.property = "text";
            this.addEventListener("enter", this.validate);

        }

        private function validate(event:Event):void
        {
            validator = emailValidator.validate();

            if (validator.type == ValidationResultEvent.VALID)
            {
                this.errorString = "";
            } else {
                this.errorString = validator.message;
            }
        }
    }
}