Navigating views from Top Bar app

Hi!

I'm building a simple app to navigate views via an app that drops down from the Top Bar. Similar to Quickie Plus (or the old free version, Quickie) and I'm unable to get the browser to go to a new page. All the methods that StackOverflow suggests are blocked.

eg.

<ahref="#"onclick="top.window.location.href='{{this.link}}';">

Gives an error of

Unsafe attempt to initiate navigation for frame with origin 'https://<subdomain>.zendesk.com' from frame with URL 'http://localhost:4567/iframe.html?origin=https%3A%2F%.zendesk.com&app_guid=d81a3df6-a20c-4ace-a6ac-5a6b8deb7d62'. The frame attempting navigation of the top-level window is sandboxed, but the flag of 'allow-top-navigation' or 'allow-top-navigation-by-user-activation' is not set.

Can I have some guidance as to how to implement this?

Thanks!