html - Angular dart radio buttons not binding to model -

i have angular dart component following html:

edit: reason of html did not copy properly. outside of label tag have:

<div class="btn-group btn-group-vertical" data-toggle="buttons"> 

`

    <label ng-repeat="item in items" class="btn btn-primary btn-sm btn-block" ng-show="isitemvisible(item)">          <input type="radio" name="options" value="{{item}}" ng-model="selected">{{item}}             <span class="badge pull-right"><span class="glyphicon glyphicon-ok"></span></span>      </label> </div>` 

however, never updates model. have tried using onclick, ng-click, , ng-change same result- functions never called. there directive i'm using incorrectly?

use future in ng-click allow model updated.

    <input type="radio" name="options" value="{{item}}"           ng-model="selected" ng-click="radiobuttonclicked();">{{item}}</input>     //component code:    void radiobuttonclicked(){             new future((){                 //use selected model here.             });    }