Hello 'dre, kamusta?
I agree with Tim. Container visibility is easy to implement. WebPagePanel is a good alternative, too. Personally, I used @Attilio_Punzi’s adaptation of JS Panel. It’s not perfect (yet) but it’s really, really, good. You can create web apps that look and behave like desktop apps with its multiple child-windows/forms that can be resized, maximized, minimized, dragged/dropped, and more.
Now I only make 2 webpages in every web app I develop: 1 for signing and the other for the home page. That’s it. The rest are just containers housed in a JS panel form.
Just my 2 cents.