Accordion - How it is possible to receive an index of active section?

Accordion - How it is possible to receive an index of active section?


$("#accordion").accordion({
active: 2
collapsible: true
});
// getter
var active = $('#accordion').accordion('option', 'active');
This code return 2, it's right?
Next, change section manually(or by means of a method activate), but
this code again return 2.
How it is possible to receive an index of active section? (in Tabs
vidget, for example: .tabs(’option’, ’selected’)).