setIt = function() {
        $element.addClass('active');
        ngModel.$setViewValue($scope.$eval($attr.ngValue));

        radioButtons.select($element);
      }
@ngdoc directive
@name ionRadio
@module ionic
@restrict E
@description
No different than the HTML radio input, except it's styled differently.

Behaves like any [AngularJS radio](http://docs.angularjs.org/api/ng/input/input[radio]).

@usage
```html
<ion-radio ng-model="choice" value="A">Choose A</ion-radio>
<ion-radio ng-model="choice" value="B">Choose B</ion-radio>
<ion-radio ng-model="choice" value="C">Choose C</ion-radio>
```