Auto Positioning of Menus upon expanding and retracting

Hi there fellas!

I’ve created a fold up/down menu similar to the one you see in Windows XP. I have attached my flash menu here.

What I do not know how to do now:
To place three or four of these menus below one another, and when a user expand or retract one of the menus, the other menus below it will follow suit and move up or down accordingly. Exactly as what you see in your Windows XP folder options on the left margin. So if I expand one menu, any menus placed below it will move/slide down to allow the above menu to expand.

I can’t find any tutorial on the above. I would be grateful if someone could give me detailed instructions on what coding to add and where. I am new with Flash and know zero about actionscipting.

Thank you very much!