package {
    import flash.display.Sprite;
    import flash.display.DisplayObject;
    import flash.ui.Mouse;
    import flash.events.*;

    public class MouseExample extends Sprite {
         private var cursor:CustomCursor;
         private var child:CustomButton;
         private var gutter:uint = 10;

        public function MouseExample() {
            child = new CustomButton();
            child.x = gutter;
            child.y = gutter;
            addChild(child);

            child.addEventListener(MouseEvent.MOUSE_OVER, mouseOverHandler);
            child.addEventListener(MouseEvent.MOUSE_OUT, mouseOutHandler);

            cursor = new CustomCursor();
            addChild(cursor);

            stage.addEventListener(Event.MOUSE_LEAVE, mouseLeaveHandler);
        }

        private function mouseOverHandler(event:MouseEvent):void {
            trace("mouseOverHandler");
            Mouse.hide();
            child.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
        }

        private function mouseOutHandler(event:MouseEvent):void {
            trace("mouseOutHandler");
            Mouse.show();
            child.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
            cursor.visible = false;
        }

        private function mouseMoveHandler(event:MouseEvent):void {
            trace("mouseMoveHandler");
            cursor.x = event.localX;
            cursor.y = event.localY;
            event.updateAfterEvent();
            cursor.visible = true;
        }

        private function mouseLeaveHandler(event:Event):void {
            trace("mouseLeaveHandler");
            mouseOutHandler(new MouseEvent(MouseEvent.MOUSE_MOVE));
        }
    }
}

import flash.display.Shape;
import flash.display.SimpleButton;

class CustomButton extends SimpleButton {
    var upColor:uint = 0xFFCC00;
    var overColor:uint = 0xCCFF00;
    var downColor:uint = 0x00CCFF;
    var size:uint = 80;

    public function CustomButton() {
        downState = new ButtonDisplayState(downColor, size+10);
        overState = new ButtonDisplayState(overColor, size);
        upState = new ButtonDisplayState(upColor, size);
        hitTestState = new ButtonDisplayState(upColor, size);
    }
}

class ButtonDisplayState extends Shape {
    var bgColor:uint;
    var size:uint;

    public function ButtonDisplayState(bgColor:uint, size:uint) {
        this.bgColor = bgColor;
        this.size = size;
        draw();
    }

    private function draw():void {
        graphics.clear();
        graphics.beginFill(bgColor);
        graphics.drawRect(0, 0, size, size);
        graphics.endFill();
    }
}

class CustomCursor extends Shape {
    var bgColor:uint = 0x333333;
    var size:uint = 10;

    public function CustomCursor() {
        visible = false;
        draw();
    }

    private function draw():void {
        graphics.clear();
        graphics.beginFill(bgColor);
        graphics.drawRect(0, 0, size, size);
        graphics.endFill();
    }
}