Providing a default StackLayout when an invalid currentIndex is selected

In a project I am working on, I have bound a StackLayout's currentIndex to an item that displays the "tabs" to show in the StackLayout. To get the switching to occur, I bind the tab selector item's currentIndex. However, if there are more "tabs" in the tab selector item than there are items in the StackLayout, a blank view gets shown.

It would be nice if a default Item could be defined, that is shown when the currentIndex is greater than zero, but doesn't map to an existing item in the StackLayout.