It is not possible to add a NavigationWindow as a child to a Tab in Alloy 1.2.2
1 Create a new Alloy mobile project
2 Put the attached index.xml in the views folder
3 Run the project
Build fails with:
[ERROR] : Invalid Tab child 'Ti.UI.iOS.NavigationWindow'
[ERROR] : Tab must have only one child element, which must be a Window
[ERROR] : Alloy compiler failed
Compile with no errors.