adEventListener

I would have expected another error, but in essence you are trying to
let something do something it can't.

Generic objects don't recognize the addEventListener method.

Something like this would give no errors (allthough be pretty useless):

var vierkant:Sprite = new Sprite();
var box:Sprite = new Sprite ();
vierkant.addEventListener(MouseEvent.MOUSE_UP, onRotateRight);
function onRotateRight(evt:MouseEvent):void {
box.rotation += 20;
}

Here 'vierkant' and 'box' are said/set to be Sprites which does
recognize the addEventListener method. It's useless because the Sprites
are never shown, even if they had substance (which they don't).

To give them substance, use:

var vierkant:Sprite = new Sprite();
with( vierkant.graphics )
{
beginFill( 0xFF0000 );
drawRect( 0, 0, 50, 50 );
endFill();
}
addChild( vierkant);

var box:Sprite = new Sprite();
with( box.graphics )
{
beginFill( 0xFF0000 );
drawRect( 0, 0, 50, 50 );
endFill();
}
box.x = 100;
box.y = 100;
addChild( box );

vierkant.addEventListener(MouseEvent.MOUSE_UP, onRotateRight);
function onRotateRight(evt:MouseEvent):void {
box.rotation += 20;
}

Here in both 'vierkant' and 'box' rectangles are created so they have
substance. They are added to the displayList (a construct of 'things'
potentially being shown on stage) so you can see them and interact with
them.

HTH (somewhat)
Manno

--
----------
Manno Bult
http://www.aloft.nl