How to replace movieclips in as3?

programming flash
1

Hi,

I have in a for statement made 12 movieclip buttons, which are called step1, step2, step3.
When you click on a “step” button I want to add a different movieclip called item on the stage and the same number as the clicked button.

This is not so hard, and I managed to do this. The problem is the following: when I click again on another Step, I want to remove the previously added item and replace this by a new item. How can I do this?

Here is the code I got so far:

    package  
{
    import flash.display.DisplayObject;
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;

    public class circular extends MovieClip {
        
        public var numItems:int = 12;
        public var angleStep:Number = 360 / numItems;
        var particlesArray:Array = new Array();
        public var circleMenu = new MovieClip
        public var obj:MovieClip
        public var contentadded:Boolean = false
        
        public var item1:MovieClip = new Step1()
        public var item2:MovieClip = new Step2()
        
        public var step:MovieClip;

        private var radius:Number = 150
        private var angle:Number = 0
        private var centerX:Number = stage.stageWidth/2
        private var centerY:Number = stage.stageHeight/2
        
        
        public function circular() {
            createCircle ();
                    }
                    
                    
function createCircle ():void {
    for (var i=0; i < numItems; i++) {

        var particle:MyMenuItem = new MyMenuItem();

        //Set the starting position (we must convert angles to radians)
        particle.y = centerY + Math.sin(angle* Math.PI/180)*radius;
        particle.x = centerX + Math.cos(angle * Math.PI/180)*radius;
        
        particle.txt.text = 'Step ' + (i + 1);
        particle.txt.mouseEnabled = false;
        particle.name = i
        particle.buttonMode = true
        
        particle.rotation = angleStep * i

        particle.addEventListener( MouseEvent.CLICK, onMenuItemClick );

        //Add the particle to the stage and push it to array for later use.
        addChild (particle);
        particlesArray.push (particle);

        angle += angleStep;

    }
}
private function onMenuItemClick(evt:MouseEvent):void {
var addContent:Array = new Array();
addContent.push(item1)
addContent.push(item2)

var i:int = evt.target.name

addChild (addContent*)
addContent*.x = 100
addContent*.y = 100

}