{"action":"opened","issue":{"url":"https://api.github.com/repos/aurelia/framework/issues/317","repository_url":"https://api.github.com/repos/aurelia/framework","labels_url":"https://api.github.com/repos/aurelia/framework/issues/317/labels{/name}","comments_url":"https://api.github.com/repos/aurelia/framework/issues/317/comments","events_url":"https://api.github.com/repos/aurelia/framework/issues/317/events","html_url":"https://github.com/aurelia/framework/issues/317","id":132594115,"number":317,"title":"CheckedObserver is not defined","user":{"login":"xiaoweil","id":4355743,"avatar_url":"https://avatars.githubusercontent.com/u/4355743?v=3","gravatar_id":"","url":"https://api.github.com/users/xiaoweil","html_url":"https://github.com/xiaoweil","followers_url":"https://api.github.com/users/xiaoweil/followers","following_url":"https://api.github.com/users/xiaoweil/following{/other_user}","gists_url":"https://api.github.com/users/xiaoweil/gists{/gist_id}","starred_url":"https://api.github.com/users/xiaoweil/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xiaoweil/subscriptions","organizations_url":"https://api.github.com/users/xiaoweil/orgs","repos_url":"https://api.github.com/users/xiaoweil/repos","events_url":"https://api.github.com/users/xiaoweil/events{/privacy}","received_events_url":"https://api.github.com/users/xiaoweil/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-02-10T02:46:40Z","updated_at":"2016-02-10T02:46:40Z","closed_at":null,"body":"Hi there,\r\n\r\nI'm trying out the latest skeleton-navigation 1.0.0-beta.1.1.3, when binding radio input button I got the following exception:\r\n\r\nUnhandled promise rejection ReferenceError: CheckedObserver is not defined\r\n\r\nat ObserverLocator.createPropertyObserver (http://localhost:9000/jspm_packages/npm/aurelia-binding@1.0.0-beta.1.1.0/aurelia-binding.js:4043:22)\r\n\r\nSample code:\r\n\r\nwelcome.ts:\r\nexport class Welcome {\r\n  colors = [{name: 'Red'}, {name: 'blue'}, {name: 'green'}];\r\n  color = this.colors[1];\r\n}\r\n\r\nwelcome.html:\r\n          `<label class=\"btn btn-default\" repeat.for=\"c of colors\">\r\n            <input type=\"radio\" name=\"color\" model.bind=\"c\" checked.bind=\"$parent.color\"/>\r\n            ${c.name}\r\n          </label>`\r\n\r\nAm I missing anything here? Thanks for your help."}}