AS3 - Adding an object to a MovieClip Container from a class - actionscript-3

Question

I'm kind of new to adding using classes in AS3, so far i've just been doing everything on frame1 of the movie. I figured I should eventually learn classes so here goes :) When I add objects onto the screen, I like to group them together in container objects for use later. So I have a board of Hex's that I'm building, and I'm trying to get them into a MovieClip named hexContainer that I have places on the stage. Now if I was doing this code like I normally would, I would just do hexContainer.addChild(tempHex). However, this is throwing me an error 1120.
My class code is as follows:
package
{
import flash.display.MovieClip
import Hex
import flash.display.Stage
public class Boards extends Hex
{
public function buildBoardOne()
{
for(var i:int = 1; i <= 5; i++)
{
var tempHex:Hex = new Hex();
tempHex.x = 100;
tempHex.y = 100;
hexContainer.addChild(tempHex);
}
}
}
}
I did in the beginning just have these added to the Stage and was getting an error when I did that, that's why the import statement is there. I had checked on google to figure out why and that's what they said to do.
Now, when I added these to the stage it worked fine. I could get my hex's and manipulate them and we partied and it was a great time. Now that I'm trying to put them into the container movie clip they are rather angry at me and I just can't appease them :p
Any help you guys could give me would be greatly appreciated.
Edited code to test out what okayGraphics suggested:
package
{
import flash.display.MovieClip
import Hex
import flash.display.Stage
public class Boards extends Hex
{
var hexContainer:MovieClip = new MovieClip();
stage.addChild(hexContainer);
public function buildBoardOne()
{
for(var i:int = 1; i <= 5; i++)
{
var tempHex:Hex = new Hex();
tempHex.x = 100;
tempHex.y = 100;
stage.addChild(tempHex);
}
}
}
}

Answer 1

You are getting an 1120 error because hexContainer is not defined in this package.
You either (1)need to declare var hexContainer = [your_reference_here] before you try to add children to it,
or
(2)you can just add the hexes as children to the Boards class, then add that to your hexContainer.
instead of hexContainer.addChild(TempHex); just put addChild(TempHex);
There's lots of other ways to do it too, but I think these two are the most straightforward approaches.