Cairngorm Code

<?xml version="1.0" encoding="utf-8"?>
<mx:Application 
    layout="vertical"
    creationComplete="handleCreationComplete()"
    xmlns:mx="http://www.adobe.com/2006/mxml">

    <mx:Script>
        <![CDATA[
            import mx.validators.StringValidator;
            import com.adobe.cairngorm.validation.ValidatorGroup;

            [Bindable]
            private var validatorGroup:ValidatorGroup = new ValidatorGroup();

            private var firstnameValidator:StringValidator = new StringValidator();

            private var lastnameValidator:StringValidator = new StringValidator();

            private function handleCreationComplete():void
            {
                firstnameValidator.required = true;
                firstnameValidator.source = firstnameInput;
                firstnameValidator.property = "text";

                lastnameValidator.required = true;
                lastnameValidator.source = lastnameInput;
                lastnameValidator.property = "text";

                validatorGroup.addValidator(firstnameValidator);
                validatorGroup.addValidator(lastnameValidator);
            }
        ]]>
    </mx:Script>

    <mx:Form>
        <mx:FormItem label="firstname">
            <mx:TextInput id="firstnameInput"
                text=""/>
        </mx:FormItem>

        <mx:FormItem label="lastname">
            <mx:TextInput id="lastnameInput"
                text="blabla"/>
        </mx:FormItem>

        <mx:FormItem 
            backgroundColor="{ validatorGroup.isValid ? 0xFF00 : 0xFF0000 }"
            label="FORM VALIDITY">
            <mx:Label text="{ validatorGroup.isValid }"/>
        </mx:FormItem>
    </mx:Form>

    <mx:Button 
        label="force validation"
        click="validatorGroup.validate()"/>
</mx:Application>