Where to put removeChild (Away3d 4.x)

Question

Hey guys i need some help on how to change primitives and removing the previous primitive showing in the scene and also changing materials on the primitive with a click of a button.
Mainly just where to put removeChild.
This is for Away3d
package
    import away3d.cameras.*;
    import away3d.containers.*;
    import away3d.controllers.*;
    import away3d.core.base.SubGeometry;
    import away3d.core.base.data.Vertex;
    import away3d.debug.*;
    import away3d.entities.Mesh;
    import away3d.extrusions.*;
    import away3d.filters.*;
    import away3d.lights.*;
    import away3d.materials.*;
    import away3d.materials.lightpickers.*;
    import away3d.materials.methods.*;
    import away3d.primitives.*;
    import away3d.textures.*;
    import away3dplus.controllers.SimpleHoverController;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Vector3D;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;
    [SWF(backgroundColor="#000000",frameRate="30",quality="LOW")]
    public class Main extends Sprite
    //engine variables
    private var view:View3D;
    private var scene:Scene3D;
    // debug
    private var awayStats:AwayStats;
    //light objects
    private var pointLight:PointLight;
    private var lightPicker:StaticLightPicker;
    //material objects
    private var redColorMaterial:ColorMaterial;
    private var skyBoxCubeTexture:BitmapCubeTexture;
    //Buttons   
    private var btnCube:Sprite = new Sprite
    private var btnSphere:Sprite = new Sprite
    private var btnCylinder:Sprite = new Sprite
    private var btnTorus:Sprite = new Sprite   
    private var btnMaterial:Sprite = new Sprite   
    private var btnWireframe:Sprite = new Sprite
        public function Main() {
            init();
            private function init():void {
                initEngine();
                initLights();
                initCamera();
                initMaterials();
                initObjects();
                initListeners();
                drawButton()
                btnCube.addEventListener(MouseEvent.CLICK, changeCube);
                btnCube.x = 400;
                btnCube.y = 25;
                addChild(btnCube);
                btnSphere.addEventListener(MouseEvent.CLICK, changeSphere);
                btnSphere.x = 400;
                btnSphere.y = 60;
                addChild(btnSphere);
                btnCylinder.addEventListener(MouseEvent.CLICK, changeCylinder);
                btnCylinder.x = 400;
                btnCylinder.y = 95;
                addChild(btnCylinder);
                btnTorus.addEventListener(MouseEvent.CLICK, changeTorus);
                btnTorus.x = 400;
                btnTorus.y = 130;
                addChild(btnTorus);
                //btnMaterial.addEventListener(MouseEvent.CLICK, changeMaterial);
                btnMaterial.x = 15;
                btnMaterial.y = 95;
                addChild(btnMaterial);
                btnWireframe.addEventListener(MouseEvent.CLICK, changeWireframe);
                btnWireframe.x = 15;
                btnWireframe.y = 130;
                addChild(btnWireframe);
             * Initialise the engine
            private function initEngine():void {
                //stage setup
                stage.scaleMode = StageScaleMode.NO_SCALE;
                stage.align = StageAlign.TOP_LEFT;
                // 3d view - window into 3d scene
                view = new View3D();
                addChild(view);
                // 3d scene.
                scene = view.scene;
                // stats
                awayStats = new AwayStats(view);
                addChild(awayStats);
             * Initialise the lights
            private function initLights():void {
                //point light
                pointLight = new PointLight();
                scene.addChild(pointLight);
                lightPicker = new StaticLightPicker([pointLight]);
            private function initCamera():void {
                var hoverCameraManager:SimpleHoverController = new SimpleHoverController(view, 700, [pointLight]);
             * Initialise Buttons
            private function drawButton():void {
                var textLabel:TextField = new TextField()
                btnCube.graphics.clear();
                btnCube.graphics.beginFill(0xFFFFFF); // white
                btnCube.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH
                textLabel.text = "CUBE";
                textLabel.x = 22;
                textLabel.y = 4;
                textLabel.selectable = false;
                btnCube.addChild(textLabel)
            var textLabel01:TextField = new TextField()   
            btnSphere.graphics.clear();
            btnSphere.graphics.beginFill(0xFFFFFF); // white
            btnSphere.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH   
            textLabel01.text = "SPHERE";
            textLabel01.x = 18;
            textLabel01.y = 3;
            textLabel01.selectable = false;
            btnSphere.addChild(textLabel01)
            var textLabel03:TextField = new TextField()   
            btnCylinder.graphics.clear();
            btnCylinder.graphics.beginFill(0xFFFFFF); // white
            btnCylinder.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH   
            textLabel03.text = "CYLINDER";
            textLabel03.x = 10;
            textLabel03.y = 3;
            textLabel03.selectable = false;
            btnCylinder.addChild(textLabel03)   
            var textLabel04:TextField = new TextField()   
            btnTorus.graphics.clear();
            btnTorus.graphics.beginFill(0xFFFFFF); // white
            btnTorus.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH   
            textLabel04.text = "TORUS";
            textLabel04.x = 17;
            textLabel04.y = 3;
            textLabel04.selectable = false;
            btnTorus.addChild(textLabel04)   
            var textLabel05:TextField = new TextField()   
            btnMaterial.graphics.clear();
            btnMaterial.graphics.beginFill(0xFFFFFF); // white
            btnMaterial.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH   
            textLabel05.text = "MATERIAL";
            textLabel05.x = 6;
            textLabel05.y = 3;
            textLabel05.selectable = false;
            btnMaterial.addChild(textLabel05)       
            var textLabel06:TextField = new TextField()   
            btnWireframe.graphics.clear();
            btnWireframe.graphics.beginFill(0xFFFFFF); // white
            btnWireframe.graphics.drawRoundRect(0, 0, 80, 25, 10, 10); // x, y, width, height, ellipseW, ellipseH   
            textLabel06.text = "WIREFRAME";
            textLabel06.x = 2;
            textLabel06.y = 3;
            textLabel06.selectable = false;
            btnWireframe.addChild(textLabel06)       
             * Initialise the materials
            private function initMaterials():void {
                // red color
                redColorMaterial = new ColorMaterial(0xFF0000, 0.8);
                redColorMaterial.lightPicker = lightPicker;
                skyBoxCubeTexture = new BitmapCubeTexture(new EnvPosX().bitmapData, new EnvNegX().bitmapData, new EnvPosY().bitmapData, new EnvNegY().bitmapData, new EnvPosZ().bitmapData, new EnvNegZ().bitmapData);
             * Initialise the scene objects
            private function initObjects():void {
                var trident:Trident = new Trident(100);
                trident.x = 0;
                trident.y = 0;
                scene.addChild(trident);
                //Geometry - Geometry is a collection of SubGeometries, each of which contain the actual geometrical data such as vertices, normals, uvs, etc.
                    ////PrimitiveBase    - PrimitiveBase is an abstract base class for mesh primitives, which are prebuilt simple meshes.
                        //CubeGeometry     A Cube primitive mesh.
                        var newCubeGeometry:CubeGeometry = new CubeGeometry(200, 200, 200, 50, 50, 50, true);
                        //SphereGeometry - A UV Sphere primitive mesh.
                        var newSphereGeometry:SphereGeometry = new SphereGeometry(50, 16, 12, true);
                        //CapsuleGeometry     A UV Capsule primitive mesh.
                        var newCapsuleGeometry:CapsuleGeometry = new CapsuleGeometry(50, 100, 16, 12, true);
                        //ConeGeometry     A UV Cone primitive mesh.
                        //var newConeGeometry:ConeGeometry = new ConeGeometry(50, 100, 16, 1, true, true);
                        //CylinderGeometry     A UV Cylinder primitive mesh.
                        var newCylinderGeometry:CylinderGeometry = new CylinderGeometry(50, 50, 100, 16, 1, true, true);
                        //PlaneGeometry     A Plane primitive mesh.
                        var newPlaneGeometry:PlaneGeometry = new PlaneGeometry(100, 100, 1, 1, true);
                        //RegularPolygonGeometry     A UV RegularPolygon primitive mesh.
                        var newRegularPoligonGeometry:RegularPolygonGeometry = new RegularPolygonGeometry(100, 16, true);
                        //TorusGeometry     A UV Torus primitive mesh.
                        var newTorusGeomentry:TorusGeometry = new TorusGeometry(50, 50, 15, 8, true);
                // Entity - The Entity class provides an abstract base class for all scene graph objects that are considered having a "presence" in the scene,
                //            in the sense that it can be considered an actual object with a position and a size (even if infinite or idealised), rather than a grouping.
                    //Mesh - Mesh agregates instance of a Geometry, augmenting it with a presence in the scene graph, a material, and an animations tate.
                    //            It consists out of SubMeshes, which in turn correspond to SubGeometries. SubMeshes allow different parts of the geometry to be assigned different materials.
                    //var cube:Mesh = new Mesh(newCubeGeometry, redColorMaterial);
                    //cube.x = 100;
                    //cube.y = 100;   
                    //cube.z = 100;
                    //scene.addChild(cube);
                    //var sphere:Mesh = new Mesh(newSphereGeometry, redColorMaterial);
                    //sphere.x = -75;
                    //sphere.y = -150;
                    //scene.addChild(sphere);
                    //var capsule:Mesh = new Mesh(newCapsuleGeometry, redColorMaterial);
                    //capsule.x = -200;
                    //capsule.y = -150
                    //scene.addChild(capsule);
                    //var cone:Mesh = new Mesh(newConeGeometry, redColorMaterial);
                    //cone.x = -200;
                    //cone.y = 150;
                    //cone.showBounds = true;
                    //scene.addChild(cone);
                    //var cylinder:Mesh = new Mesh(newCylinderGeometry, redColorMaterial);
                    //cylinder.x = -75;
                    //cylinder.y = 150;
                    //scene.addChild(cylinder);
                    //var plane:Mesh = new Mesh(newPlaneGeometry, redColorMaterial);
                    //plane.x = -75;
                    //plane.y = 275;
                    //scene.addChild(plane);
                    //var poligon:Mesh = new Mesh(newRegularPoligonGeometry, redColorMaterial);
                    //poligon.x = -275;
                    //poligon.y = 275;
                    //scene.addChild(poligon);
                    //var torus:Mesh = new Mesh(newTorusGeomentry, redColorMaterial);
                    //torus.x = -275;           
                    //scene.addChild(torus);
                    //SkyBox     A SkyBox class is used to render a sky in the scene.
                    //var skyBox:SkyBox = new SkyBox(skyBoxCubeTexture);
                    //scene.addChild(skyBox);
                    // SegmentSet
                        //WireframeAxesGrid - Class WireframeAxesGrid generates a grid of lines on a given planeWireframeAxesGrid
                        //var wireFrameAxesGrid:WireframeAxesGrid = new WireframeAxesGrid(4, 400, 1);
                        //scene.addChild(wireFrameAxesGrid);
                        //WireframeGrid     Class WireframeGrid generates a grid of lines on a given planeWireframeGrid
                        //var wireframeGrid:WireframeGrid = new WireframeGrid(10, 100, 5, 0x0000FF);
                        //wireframeGrid.x = 75;
                        //wireframeGrid.y = 275;
                        //scene.addChild(wireframeGrid);
                        //WireframePrimitiveBase
                            //WireframeCube    - Class WireFrameGrid generates a grid of lines on a given planeWireFrameGrid
                            //var wireFrameCube:WireframeCube = new WireframeCube(100, 100, 100, 0x0000FF, 5);
                            //wireFrameCube.x = 75;
                            //scene.addChild(wireFrameCube);
                            //WireframeSphere - Class WireFrameGrid generates a grid of lines on a given planeWireFrameGrid
                            //var wireFrameSphere:WireframeSphere = new WireframeSphere(50, 16, 12, 0x0000FF, 5);
                            //wireFrameSphere.x = 75;
                            //wireFrameSphere.y = -150;
                            //scene.addChild(wireFrameSphere);
                            //WireframePlane
                            //var wireframePlane:WireframePlane = new WireframePlane(100, 100, 10, 10, 0x0000FF, 5);
                            //wireframePlane.x = 175;
                            //wireframePlane.y = 275;
                            //scene.addChild(wireframePlane);
             * Initialise the listeners
            private function initListeners():void {
                addEventListener(Event.ENTER_FRAME, onEnterFrame);
             * render loop
            private function onEnterFrame(event:Event):void {
                view.render();
             * Intialise the buttons events
            private function changeCube(event:MouseEvent):void {
                var newCubeGeometry:CubeGeometry = new CubeGeometry(200, 200, 200, 50, 50, 50, true);
                var cube:Mesh = new Mesh(newCubeGeometry, redColorMaterial);
                cube.x = 100;
                cube.y = 100;   
                cube.z = 100;
                scene.addChild(cube);
                private function changeSphere(event:MouseEvent):void {   
                     var newSphereGeometry:SphereGeometry = new SphereGeometry(50, 16, 12, true);
                     var sphere:Mesh = new Mesh(newSphereGeometry, redColorMaterial);
                     scene.addChild(sphere);
                private function changeCylinder(event:MouseEvent):void {   
                    var newCylinderGeometry:CylinderGeometry = new CylinderGeometry(50, 50, 100, 16, 1, true, true);
                    var cylinder:Mesh = new Mesh(newCylinderGeometry, redColorMaterial);
                    scene.addChild(cylinder);
                private function changeTorus(event:MouseEvent):void {   
                    var newTorusGeomentry:TorusGeometry = new TorusGeometry(50, 50, 15, 8, true);
                    var torus:Mesh = new Mesh(newTorusGeomentry, redColorMaterial);
                    scene.addChild(torus);
                private function changeWireframe(event:MouseEvent):void {   
                    var wireFrameCube:WireframeCube = new WireframeCube(100, 100, 100, 0x0000FF, 5);
                    scene.addChild(wireFrameCube);
Thanks, Matthew

Answer 1

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Thanks for your replies.
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Thanks
Shopping for another "Mac Pro Late 2013" or I might settle for my "Mac Mini 2012 i7 16 Gig 256 SSD Intel 4000" refurb with warranty bought from Apple that I already have on hand.
Thank You
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Thanks