AS2-Change Instance Name of Array Item

Hello - I think this is easy, but haven’t hit the right solution. Searched forum to no avail.

I have an array of buttons. When an array item is clicked, it executes several lines of code. I want to also amend the item’s instance name so a different set of code can be applied to buttons already clicked.

I’ve tried this and similar and don’t have it right yet:

navButton*.onRelease = function() {
	this.enabled = false;
	this._name = (this._name + "b"); //add "b" to instance name of this
	pastBtn.enabled = true;
	pastBtn._alpha = 100;
	pastBtn.bSelected = false;
	pastBtn = this;
}

Thanks for the help.