[HELP] flash website that can scroll down in browser

probably this is something very basic that i should have known, but unfortunately I could not sort out so I want to ask for help;

I have a flash made website that is published in html.

stage code in the main frame reads as;

stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;

(any other code on main frame is related with position of components, or event related to them; so I guess above bit is the only part related to stage size)
most content auto aligns themselves based on current stage size; so the content is displayed in a balanced positioning regardless of browser size.

This website shows content in browser with browser current size always (ie; if the browser is scaled to 400:600 then I only see the top left 400:600 area of page), and browser does not produce scrollers.

For a new page I would like to make it so that; width will still scale to stage (so no horizontal scroller will appear on the browser); but for the height I would like the browser to produce a scroller so I can drag down and see the content below the current stage. I have no idea how to do that, and would really appreciate if you can help me.

Thank you !