Create custom ion-input not working

I stumbled on this code in my Plunkr https://plnkr.co/edit/y9SIdr1qSF0kq76Kdnzb?p=preview which shows a working example of a form component. However this component is pure Angular2. I am unable to create the same for a custom ion-input component.

Is anyone able to create a Ionic2 component which shows the same behaviour and binds to a formcontrol?