constructor(bindingEngine: BindingEngine){
    this.name = 'Vlad';

    let subscription = bindingEngine
      .propertyObserver(this, 'name')
      .subscribe(this.nameChange);
  }

 export function observe(object: any, property: string): PropertyObserver {
   if (!__ob) {
     __ob = UIUtils.lazy(BindingEngine);
   }
   return __ob.propertyObserver(object, property);
 }

 private recurse(target, property, subscriptions, callback, path) {
     let sub = target[property];
     if (typeof sub === "object") {
         for (var p in sub)
             if (sub.hasOwnProperty(p)) {
                 this.recurse(sub, p, subscriptions, callback, `${path}${sub instanceof Array ? '[' + p + ']' : '.' + p}`);
             }
     }
     if (target != property) // Avoid re-observice root node
     {
         subscriptions.push(this._bindingEngine.propertyObserver(target, property).subscribe((n, o) => callback(n, o, path)));
     }
 };

    public observe(target: Object, property: string, callback: (n: any, o: any, name: string) => void): () => void {
        var subscriptions: { root: any, children: any[] } = { root: null, children: [] };

        subscriptions.root = (this._bindingEngine.propertyObserver(target, property)
            .subscribe((n, o) => {
                this.disconnect(subscriptions.children);
                let path = property;
                this.recurse(target, property, subscriptions.children, callback, path);
            }
            )
        );
        return () => { this.disconnect(subscriptions.children); subscriptions.root.dispose(); }
    }

    subscribeProperties()
    {
        this.bindingEngine.propertyObserver(this, 'searchPhrase').subscribe((newValue, oldValue) => {
            if (newValue.length === 0) {
                this.users = [];
                return;
            }

            if (newValue.length < 3)
                return;

            this.findUsersBySearchPhrase();
        });
    }

 attached(){
     this.subscription = this.bindingEngine.propertyObserver(this, 'post').subscribe(this.update);
     this.update(this.post);
 }