//Person.as:
package
{
    [Bindable]
    public class Person
    {
        public var name:String = "";
        public var age:int = 0;

        public function Person(name:String="", age:int=0):void
        {
            this.name = name;
            this.age = age;
        }
    }
}

//Main.as:
package
{
    import mx.binding.utils.BindingUtils;
    import mx.binding.utils.ChangeWatcher;
    import flash.display.*;
    import flash.text.*;

    public class Main extends MovieClip
    {
        [Bindable]
        public var person:Person;
        public var name_tf:TextField;
        public var age_tf:TextField;

        public var tf1:TextField;

        [Bindable]
        [Bindable(event="change")]
        public var tf2:TextField;

        public function Main()
        {
            super();

            name_tf = new TextField();
            age_tf = new TextField();
            name_tf.border = age_tf.border = true;
            age_tf.x = 100;
            addChild(name_tf);
            addChild(age_tf);

            ChangeWatcher.watch(this, "person", onPersonReferenceChange);
            this.person = new Person();
            this.person.name = "jan";
            this.person.age = 21;

            ChangeWatcher.watch(this, "tf2", onTextFieldReferenceChange);
            tf1 = new TextField();
            tf2 = new TextField();
            tf1.border = tf2.border = true;
            tf1.type = TextFieldType.INPUT;
            tf1.y = tf2.y = 100;
            tf1.height = tf2.height = 24;
            tf2.x = 100;
            addChild(tf1);
            addChild(tf2);
        }
        private function onTextFieldReferenceChange(event:Event):void
        {
            BindingUtils.bindProperty(tf2, "text", tf1, 'text');
        }
        private function onPersonReferenceChange(event:Event):void
        {
            BindingUtils.bindProperty(name_tf, 'text', person, 'name');
            BindingUtils.bindProperty(age_tf, 'text', person, 'age');
        }
    }
}