I am completely perplexed. I asked this question and it (any mentioned solution) doesn't seem to be working at all.

All I want is to draw a line from one corner to the other.

Here again is the link to the SWF file I have (it's embedded in an HTML document): test.html

Here is the source:

package 
{
    import flash.display.Sprite;
    import flash.events.Event;

    public class Main extends Sprite 
    {

        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point

            graphics.clear();
            graphics.lineStyle(10, 0x000000);

            graphics.moveTo(0, 0);
            graphics.lineTo(stage.stageWidth, stage.stageHeight);
        }

    }

}

It just doesn't work! The line goes from somewhere offscreen to about the middle of the stage. What on earth am I doing wrong?