selected tabbed button?

[Kee Nethery]

I have created a tabbed button with 4 items in the list.

When I click on it, the hilites for the selections change to the tab 
that has been selected. This is good, it is the desired behavior.

I want to navigate to various cards based upon which tab is selected.

#1 What do I need do in script to know that a tab has been selected 
and how do I know which tab has been selected?

#2 How would I figure this out without asking this mailing list?

Kee Nethery