Working on the navigation. Also, better design for storing the "root" or "parent" object of the Activity.  it has always been parsed in the fragment, but now it is also pared in the Activity and saved there, so that the Activity does not have to communicate downward to the fragment, and it makes it easier.   Also, working on the onMenuItemSelected(menu item) method in the ItemListActivity so that it navegates or doesnt navegate at all.  right now, it will exit the program if the top action bar is hit, even though the navegation button display is turned off.