Loading ExternalResource url's in Vaadin 8 Tabsheet - Work around for "Refu

Iam trying load two ExternalResource url’s in Tabsheet but getting “Refused to display ‘http://localhost:8084/ui’ in a frame because it set ‘X-Frame-Options’ to ‘deny’”. But able to load tabsheet with Vaadin url’s without any issue. BrowserFrame browser = new BrowserFrame(“Browser”,new ExternalResource(“http://demo.vaadin.com/sampler/”));. Any suggestions or help on this will be appreciated.