SHOW_TAB1, SHOW_TAB2, etc (SHOW_TABx) are names of events fired by the application.
I have read once again Slaker demo comments http://puremvc.org/content/view/92/1/
I understood that tabNavigator has a default creation policy set to auto to improve application startup speed.
I said that my ApplicationMediator adds and removes mediators linked to tabs depending on selected tab.
Is it usefull to remove mediators ?
Does tabNavigator remove view components when they are not needed for a long time ?
If removing is useless, I just have to create and register needed mediators the first time user selects a tab.