Question: How can I add the MovieClip I have put into the array to the Stage?
The following code is a separated .as file and located at the same level with the main.fla
I have tried many times but I got the error message - 

> 
> "ReferenceError: Error #1065: Variable stage is not defined. at Set1()
>  at main\_fla::MainTimeline/frame1()"
> 
> 
> 

How can I do? Thank for any help!!

```
package 
{
    import flash.display.MovieClip;
    import flash.display.Stage;
    public class Set1
    {
        private var map:Array=new Array();

        public function Set1()
        {
            for (var i:Number=0; i<5; i++)
            {
                var cell_mc=new cell();
                cell_mc.x = 50+ i*cell_mc.width;
                cell_mc.y = 50;
                cell_mc.className=i;
                map[i] = cell_mc;
                trace(map[i].className);
                stage.addChild(map[i]);
                }

        }

    }

}

```

Answer: 
You are a little mixed up. `stage` is not a magic variable, instead it is a property that is inherited from the `DisplayObject` base class. That property gets set internally when a display object is added to the stage. So in your case your class needs to either inherit from a `DisplayObject`– probably `Sprite` class. Or simply inject a reference to the `Stage` from the outside when you invoke your function
First you need to set the Main flash file class.You'll do that by clicking on stage in your fla. file and edit you class in properties(should look like this(class:Set1))
Code below should work fine

```
 package 
    {
        import flash.display.MovieClip;
        import flash.display.Sprite;
        public class Set1 extends Sprite
        {
            private var map:Array=new Array();

            public function Set1()
            {
                for (var i:Number=0; i<5; i++)
                {
                    var cell_mc=new cell();
                    cell_mc.x = 50+ i*cell_mc.width;
                    cell_mc.y = 50;
                    cell_mc.className=i;
                    map[i] = cell_mc;
                    trace(map[i].className);
                    addChild(map[i]);
                    }

            }

        }

    }

```