Remove or hide MC from stage

Question

hey, im trying to remove these movie clips from the stage but its not  working. Im spawning the movie clip to the stage every time i slide the  timeline_slider, which is instance name for a slider component.
I manage to put the spawned movie clip in a array using push, but i don't know how to delete them.
Because what i want to happen is that every time i slide the slider i  only want a certain amount of movie clips on the stage, but what is  happening is they spawn on the stage and stay there.
for example. if i slide 1 across it spawns 5 mc if i slide again to the  second increment it spawn 4 so total number on movie clips on the stage  is 9.
i want to only spawn the number of movie clips that increment on the  slider is set to. i would also like it to work backwards as well, so if  im on the second increment it should have 4 movie clips on the stage,  and if i go back to the first increment i should only have 5 movie clips  on the stage.
hope that makes sense
Even just hiding the movie clips and unhiding the movie clips is fine as well.
this is my code for spawning with the slider
this is my arrays of the numbers are now many movie clips i want to spawn to the stage.
Code:
var rdCounts:Array = [5516 / 1000,5517 / 1000,5570 / 1000,5585 / 1000,5596 / 1000,5656 / 1000,5804 / 1000,5965 / 1000,8692 / 1000,15194 / 1000,16475 / 1000];
          var NewAuspop:Array= new Array();
Code:
timeline_slider.addEventListener(SliderEvent.CHANGE, dotspawn);
function dotspawn(e:SliderEvent)
               var theAmount:int = rdCounts[timeline_slider.value];
               for (var i:int = 0; i < theAmount; ++i)
                    var rd = new red_dot();
                    addChild( rd );
                    NewAuspop.push( rd );
                    trace(NewAuspop);
                    rd.x = square_mc.x + Math.random() * square_mc.width;
                    rd.y = square_mc.y + Math.random() * square_mc.height;
                    var myTween:Tween = new Tween(rd,"x",Elastic.easeOut,square_mc.x,square_mc.x + Math.random() * square_mc.width,3,true);

Answer 1

Try this for re-tweening (I don't try this code - so I don't have visual reference and you need to fine-tune it yourself):
function dotspawn(e:SliderEvent)
     var theAmount:int = 0;
     for (var i:int = 0; i < timeline_slider.value; i++ ) {
          theAmount += rdCounts[timeline_slider.value];
     // remove unneeded objects
     while (NewAuspop.length >= theAmount) {
          // remove first element from display list
          removeChild(NewAuspop[0]);
          // remove first element from array
          NewAuspop.shift();
     var rd:red_dot;
     // add objects if array is short of the Amount
     while (NewAuspop.length < theAmount) {
          rd = new red_dot();
          addChild( rd );
          NewAuspop.push( rd );
          trace(NewAuspop);
     for each(rd in NewAuspop) {
          rd.x = square_mc.x + Math.random() * square_mc.width;
          rd.y = square_mc.y + Math.random() * square_mc.height;
          var myTween:Tween = new Tween(rd,"x",Elastic.easeOut,square_mc.x,square_mc.x + Math.random() * square_mc.width,3,true);
Message was edited by: Andrei1