Output array number on release

i have a set of buttons outputted by using an array/loop (through xml).

when i click on a button i want to get the array number of the specific item i click on.

here’s my logic:

 for(i = 0; i < totalList; i++) {
            this.container["item_" + i].bg.onRelease = function () {
                       itemClicked = this*;
                       trace(itemClicked);
            }
}

so basically i need to know what i would replace this* with in order for it to actually output it’s array number.

any help would be greatly appreciated!