Lazy Tab is not lazy

[TienNK1987]

It sounds like the lazy tab is not really lazy. As I see when debugging my app, TabView always initializes all ContentView in all TabViewItem (Tab content) when opening the page.

[AswinPG]

In my experience it was quite the opposite (android), On each tab change the contentview was initialised every time. Shouldn't it be initialised only once. So we can have good statrtup as well as runtime performance. In current situation runtime performance is low while using Lazyload

[jsuarezruiz]

Refactoring and improving several parts of the control: #12
I will check thoroughly the best option to have Lazy Loading.

Thanks for all your feedback.