protect navigation in unauthorized url

Dear support,

In the your application “admin app” you can change the content only with url, this is the nice but a unauthorized customer can be ready unauthorized document.

https://webix.com/demos/admin-app/#!/app/forms
https://webix.com/demos/admin-app/#!/app/orders

I try to proctect the application with a login form, but we can always insert an old link

https://webix.com/demos/admin-app/#!/app/orders

Thanks
Piergiorgio