(modified) Update example to show how to do navigation with tabbed pages

[felipecastagnarodecarvalho]

A more clean version of how to deal with tabbed navigation. Please, let me know if this could be somehow improved.

[dnfadmin]

All CLA requirements met.

[brianlagunas]

Closing as the CLA has not been signed

[felipecastagnarodecarvalho]

@brianlagunas sorry about that, I just signed it now. Please consider it. Thanks!

[brianlagunas]

Thank, we will review when we have time. At a quick glance I can already see a number of issues that will need to be changed/fix