ActionScript 3.0 :: Add Roll Over Functionality To Via An Event Listener?

I'm creating a custom charting component that renders 100 +/- rectangles in a UIComponent, each of which represents 1%. So, basically a piechart with boxes instead of pie slices.On top of each rectangle, I'm rendering a transparent Sprite that I need to add roll over functionality to via an event listener.The final event handler will fire a custom tooltip.

I'm trying to add these event listeners recursively as I iterate through the dataprovider (ArrayCollection) for my chart. The event registers, however, the value I'm trying to pass the event handler is the first value in the iteration and doesn't seem to register subsequent values. Does anyone have experience adding event listeners recursively like this? Can anyone recommend a better way of accomplishing this task?

Code:

private function buildCubes():void {

var i:Number = 0;
var x:Number = 0;[code]......