Keep Coding

Brand new to programming so I apologize in advance.
I'm trying to set up a game where after each time a button is pressed, a new instance of a MC is added to stage, then I need a collision detection for an existing object with any of the new instances of the MC. I need to add one instance to the stage at a time and once it reaches 8 instances, I need it to stop adding children but still be able to detect collisions with any of the instances. As it stands now it just replaces the MC or MCs into the new random position. Heres what my code looks like so far:
var pinkBox:pinkClass = new pinkClass();
var pinkArray:Array = new Array();
myButton.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownleftBtn);{
function mouseDownleftBtn(e: Event): void {
for(var i=0; i<8; i++)
{
addChild(pinkBox);
pinkArray.push(pinkBox);
pinkBox.x = Math.random()*stage.width;
}
myButton.startDrag();
}
}
addEventListener(Event.ENTER_FRAME, checkCollision);
function checkCollision(event:Event){
if (myButton.hitTestObject(pinkBox)) {
trace("hit")
}}